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OPTIMAL SUBSTRUCTURE OF SET-VALUED SOLUTIONS OF NORMAL-FORM GAMES AND COORDINATION

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Journal of Systems Science & Complexity 2009年第1期22卷 63-76页

作者： norimasa KOBAYASHI Kyoichi KIJIMA Department of Value and Decision Science.Tokyo Institutc of Technology

A number of solution concepts of normal-form games have been proposed in the literature on subspaces of action profiles that have Nash type stability. While the literature mainly focuses oil the minimal of such stable subspaces, this paper argues that non-minimal stable subspaces represent well the multi-agent situations to which neither Nash equilibrium nor rationalizability may be applied with satisfaction. As a theoretical support, the authors prove the optimal substructure of stable subspaces regarding the restriction of a game. It is further argued that the optimal substructure characterizes hierarchical diversity of coordination and interim phases in learning.

关键词： Coordination curb set learning Nash equilibrium optimal substructure prep set rationalizability restriction retract.

Unsteady Flow at Low Flow-rate Region in a Semi-open Propeller Fan (Velocity Fluctuation outside of Blade Tip)

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Journal of Thermal Science 2011年第3期20卷 218-223页

作者： norimasa SHIOMI Yoichi KINOUE Toshiaki SETOGUCHI Department of Mechanical Engineering Saga UniversityHonjo-machi 1Saga-shiSaga840-8502Japan

In order to clarify the unsteady flow fields at low flow-rate region with positive gradient on pressure-flow-rate curve,the experimental investigation was carried out at rotor inlet and outside of rotor blade tip without casing in a semi-opened propeller fan using a hot-wire anemometer.A single I-type hot-wire probe was used,and the data obtained were processed by the use of phase-locked averaging,ensemble averaging and FFT *** flow fields at rotor inlet and outside of rotor blade tip were discussed mainly using the results from distributions of velocity fluctuations and power spectrum *** was found from these results that there are the two types of different periodical fluctuations and both of those frequencies were not the same of rotor rotating frequency(RRF;15Hz).One was observed at relatively high flow-rate region at relatively downstream area in measurement and its frequency was approximately 7Hz(47% of RRF).The other was observed at relatively low flow-rate region at relatively upstream area in measurement and its frequency was approximately 10Hz(67% of RRF)".As the velocity fluctuations with the flow fields are rapidly increased by the former fluctuation,it is thought that its fluctuation is the trigger of blade stall.

关键词： Semi-opened fan Propeller fan Unsteady flow measurement and FFT analysis

Corner Separations around a NACA65 Blade in a Decelerating Flow (Experimental Investigations by Five-Hole Probe and PIV)

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Journal of Thermal Science 2013年第1期22卷 23-28页

作者： Yoichi Kinoue Ryutaro Ohhira norimasa Shiomi Toshiaki Setoguchi Department of Mechanical Engineering Saga University Institute of Ocean Energy Saga University

In order to examine the fundamental characteristics of corner separation in a decelerating cascade flow,the experimental apparatus was made and separations around a NACA65 blade in a decelerating channel flow were ***-dimensional calculations show that the NACA65 cascade flow that has 45 *** turning,1.24 of solidity and 17 *** stagger angle is equivalent to the channel flow that has 14 *** stagger angle in terms of pitchwise blade *** investigation by five-hole probe shows that the accumulations of low energy fluid can be seen around the corner part and the overturning flow due to the secondary flow ***,as the periodicity of the blade wake in a pitchwise direction is comparably good,the wake of this channel flow is similar to the wake of the cascade flow for two pitch *** measurement results shows that a vortex pattern can be seen in the momentary streamline on the suction surface of the blade and in the averaged streamline on the perpendicular to both the suction surface and the endwall.

关键词： corner separation NACA65 blade decelerating channel flow five-hole probe PIV

Annular Supersonic Swirling Flows with Heterogeneous Condensation

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Journal of Thermal Science 2016年第6期25卷 518-525页

作者： Yusuke FUKUSHIMA Shigeru MATSUO norimasa SHIOMI Toshiaki SETOGUCHI Graduate School of Science & Engineering Saga University Department of Advanced Technology Fusion Saga University Department of Mechanical Engineering Saga University Institute of Ocean Energy Saga University

In recent years,separating and extracting technologies of condensate gas have been developed by combining a swirl flow with non-equilibrium condensation phenomena of condensate gas generated in a supersonic *** technology can reduce the size of the device and does not use ***,there are many unresolved problems for performance of the separation,extraction and operating *** it is necessary to research further in order to improve the performance of the *** the present study,the numerical study was carried out to clarify the effect of the heterogeneous condensation on the characteristics of the swirling flow field in a supersonic annular nozzle,and the differences between homogeneous condensation and heterogeneous condensation in the flow *** the results,it is found that the condensation flow with a swirl affects the position of sonic line,the generating position of condensate and the radial distribution ratio of liquid phase.

关键词： condensation supersonic heterogeneous condensate viscosity chemicals generating annular nozzle regardless

Vortices within the Separation Region in a Decelerating Channel Flow (Effect of Inlet Velocity Gradient)

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Journal of Thermal Science 2005年第4期14卷 341-345页

作者： Yoichi KINOUE Toshiaki SETOGUCHI Mohammad MAMUN norimasa SHIOMI Kenji KANEKO Department of Mechanical Engineering Saga University1HonjoSaga840-8502Japan

An experimental investigation was made into three-dimensional separated flow and the vortices within the flow separation in a decelerating channel flow generated by the suction from a porous side wall. The flows along the side and bottom walls were visualized by the surface tuft method. The turbulent internal flow was measured by the split-film probe to investigate the turbulent flow including the reverse flow. In the flow visualization for the strong decelerating flow （the suction flow ratio：0.8）, two typical flow patterns appear alternatively. One is that the flow near the bottom wall separates more upstream than the flow near the top wall and a clockwise vortex can be seen in the separation region. Another is the reversal flow pattern with a counterclockwise vortex. By the turbulent flow measurement using the split-film probe, two peaks of turbulence level are observed for the strong decelerating flow case. These peaks can be related with two flow patterns mentioned above.

关键词： vortices within the separation decelerating channel flow turbulent flow split-film probe

Flow Fields with Tip Leakage Vortex in a Small Axial Cooling Fan

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Journal of Thermal Science 2008年第2期17卷 156-162页

作者： norimasa Shiomi Ying zi Jin Kenji Kaneko Yoichi Kinoue T. Setoguchi Department of Mechanical Engineering Saga University 1 Honjo-machi Saga 840-8502 Japan Institute of Mechatromcs Zhejiang Sci-Tech University Hangzhou 310018 China

In order to improve the fan characteristics, especially efficiency and noise level of a small axial cooling fan with a large tip clearance, the internal flow measurements with tip leakage vortex were carried out at fan rotor outlet us- ing an I-type hot-wire probe. The probe was set toward two directions, parallel and normal to the meridional plane of test fan, and the two directional velocity components were measured. From the result of fan test it was found that the test fan didn＇t have the unstable characteristic with a positive gradient on its pressure - flow-rate curve. From the results of velocity measurement it was observed that the tip leakage vortex exited at maximum efficiency flow-rate and large flow-rate conditions. However, at small flow-rate conditions the tip leakage vortex was not observed and it was found that the flow field were enlarged toward radial outwards

关键词： Axial fan cooling fan internal flow and tip leakage vortex

Flow Fields with Vortex in a Small Semi-open Axial Fan

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Journal of Thermal Science 2009年第4期18卷 294-300页

作者： norimasa. Shiomi Yoichi Kinoue Ying zi Jin Toshiaki Setoguchi Kenji Kaneko Department of Mechanical Engineering Saga University 1 Honjo-machi Saga 840-8502 Japan Institute of Mechatronics Zhejiang Sci-Tech University Xiasha Higher Educational Zone Hangzhou 310018 China

In order to clarify the effect of tip clearance （TC） size on fan performance and the flow field at rotor outlet in a small semi-open axial fan, the experimental investigation was carried out. The tip diameter of test fan rotor was 180mm and test TC sizes were lmm （TC=1mm） and 4mm （TC=4mm）. Fan characteristics tests were carried out for two cases of TC size and three-dimensional velocity fields at rotor outlet were measured using a single slant hot-wire probe at four flow-rate conditions. As a result, it was found that the pressure - flow-rate characteristics curves for two cases showed almost the same tendency. However, the ensemble averaged velocity profiles along radial measurement stations of TC-4mm largely changed compared with that of TC=1mm in cases of small flow-rate condition. From the phase-locked averaging results, it was also found that the vortex existed in the rotor outlet flow field of high flow-rate condition for each TC case. Compared with the vortices for TC=1mm and TC=4mm, the vortex for TC=4mm was stronger than that for TC=1mm.

关键词： fan semi-open type vortex tip clearance

Preliminary Deformation Experiment of Ringwoodite at 20 GPa and 1 700 K Using a D-DIA Apparatus

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Journal of Earth Science 2010年第5期21卷 517-522页

作者： Takaaki Kawazoe Tomohiro Ohuchi norimasa Nishiyama Yu Nishihara Tetsuo Irifune Geodynamics Research Center Ehime University Senior Research Fellow Center Ehime University

A deformation experiment of ringwoodite with a strain of 9% was achieved at 20 GPa and 1 700 K and at a strain rate of 3×10^-5 s^-1 using a deformation-DIA （D-DIA） apparatus and a multi-anvil 6-6 （MA 6-6） assembly. The crystallographic orientations of the deformed sample were successfully analyzed by the electron backscatter diffraction （EBSD） method, although any notable latticepreferred orientation （LPO） was not observed presumably due to the insufficient strain in the present experiment. In this study, the deformation experiment on ringwoodite succeeded at P-T conditions consistent with the lower part of the mantle transition zone and at a controlled strain rate for the first time. The present study extended the pressure range of deformation experiments in the D-DIA apparatus from 16 GPa in our earlier study to 20 GPa at 1 700 K. The successful extension of the pressure range demonstrates potential importance of the D-DIA apparatus in studying rheological properties of minerals under the P-T conditions of the whole mantle transition zone.

关键词： ringwoodite mantle transition zone rheology viscosity mantle dynamics.

Technical Development of Simple Shear Deformation Experiments Using a Deformation-DIA Apparatus

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Journal of Earth Science 2010年第5期21卷 523-531页

作者： Tomohiro Ohuchi Takaaki Kawazoe norimasa Nishiyama Yu Nishihara Tetsuo Irifune Geodynamics Research Center Ehime University Senior Research Fellow Center Ehime University

Technical developments for simple shear deformation experiments at high pressures were made. The newly designed cell assembly can be compressed by deformation-DIA apparatuses with the MA 6-6 system, which consists of six second-stage tungsten carbide anvils （with a truncated edge length of 5 mm） and the anvil guide. Deformation of samples was barely observed during the compression process, showing that the shear strain of the deformed samples can be measured by the rotation of a strain marker. Simple shear deformation experiments on anhydrous and hydrous oli- vine aggregates were conducted under upper mantle conditions （pressures of 5.2-7.6 GPa and temperatures of 1 473-1 573 K）, and sample deformation with a shear strain of 7=0.8-1.2 was successfully achieved at a shear strain rate of 4.0×10^-5-7.5×10^-5 s^-1. The present study extended the pressure range of simple shear deformation experiments in the deformation-DIA apparatus from 3 GPa in an early study to 7.6 GPa at high temperatures.

关键词： simple shear deformation deformation-DIA MA 6-6 upper mantle.