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Journal of Thermal Science 2006年第4期15卷 342-348页

作者： MizueMUNEKATA KaoruKAWAHARA TakamasaUDO HiroyukiYOSHIKAWA HidekiOHBA kumamoto university 2-39-1 KurokamiKumamoto 860-8555Japan

The purpose of this study is to investigate the characteristics of aerodynamic sound generated from wake interference of circular cylinder and airfoil vane located in tandem and to clarify the generation mechanism of the sound source with discrete frequency. The effects of the interval between the cylinder and the airfoil on the characteristics of aerodynamic sound are investigated by acoustic measurement, flow visualization and exploration test of sound source. The relation between the flow field and the sound field with discrete frequency noise（DFN） is shown, and then it is found that the downstream airfoil works as the sound source of DFN, which has the frequency of vortex shedding from the upstream cylinder, when the interval of two bodies is longer than a critical distance.

关键词： aerodynamic sound wake interference circular cylinder airfoil Karman's vortex flow visualization

Microstructural Characteristics of Underwater Shock Consolidated Aluminum Composites

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Journal of Materials Science & Technology 2003年第4期19卷 341-345页

作者： K.Raghukandan K.Hokamoto J.S.Lee A.Chiba B.C.Pai Department of Mechanical Engineering and Materials Science Kumamoto UniversityKumamotoJapanShock Wave and Condensed Matter Research Center2-39-1 KurokamiKumamoto UniversityKumamotoJapanGraduate studentGraduate School of Science and TechnologyKumamoto UniversityKumamotoJapanDepartment of Mechanical Engineering and Materials ScienceKumamoto UniversityKumamotoJapanRegional Research LaboratoryThiruvananthapuramKeralaIndia

Metal matrix composites (MMCs) offer extra strength and high temperature capabilities in comparison with unrein-forced metals. Aluminum composites possess higher stiffness, strength, fatigue properties and low weight advantages. Carbon fiber reinforced Al composites (Al-Cf) and silicon carbide particulate reinforced Al composites (AI-SiCp) were shock densified using axisymmetric assemblies for underwater explosions. Unidirectional planar shock waves were applied to obtain uniform consolidation of the composites. The energy generator was a high explosive of 6.9 km/s detonation velocity. Irregular morphological powders of Al were the base material. The reinforcement ratio was 15 Vol. pet for Al-Cf composites and 30 Vol. pet for AI-SiCp composites. The microstructural and the strength characteristics of the shock consolidated Al composites are reported.

关键词： Shock consolidation Aluminum composites Microstructure Strength characteristics

Numerical Analysis of Thermal Convections in a Three-dimensional Cavity: Influence of Difference in Approximation Models on Numerical Solutions

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Journal of Thermal Science 2004年第3期13卷 283-288页

作者： Kazuyoshi MATSUZAKI Hideki OHBA Mizue MUNEKATA Mechanical Engineering and Materials Science Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 JapanMechanical Engineering and Materials Science Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 JapanMechanical Engineering and Materials Science Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 Japan

In order to develop the practical approximation models suitable to flow fields at low Mach number with large temperature difference, the influence of difference in approximation models on numerical solutions was investigated by solving the natural convection in the 3-D enclosures with vertical sidewalls differentially heated and the heated bottom wall using 3 approximation models, that is Boussinesq approximation, low Mach Number approximation and approximation model proposed by Mlaouah. As results of the simulation, the effects of the differences in the three approximation models on the numerical solutions become clear.

关键词： thermal convection approximation model numerical analysis 3-D cavity.

Applicability of LIVE/DEAD BacLight stain with glutaraldehyde fixation for the measurement of bacterial abundance and viability in rainwater

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Journal of Environmental Sciences 2017年第1期29卷 202-213页

作者： Wei Hu Kotaro Murata Daizhou Zhang Faculty of Environmental and Symbiotic Sciences Prefectural University of KumamotoKumamoto 862-8502Japan

Rainwater contains substantial bacteria and rain is an efficient pathway for the dissemination of bacteria from the atmosphere to land and water ***,quantitative information on rainwater bacteria is very limited due to the lack of a reliable *** this study,the epifluorescence microscopy enumeration with the LIVE/DEAD BacLight Bacterial Viability Kit stain was verified to quantify the abundance of viable and non-viable bacterial cells in rainwater,with the 4＇,6-diamidino-2-phenylindole（DAPI） stain for the reference of total cell *** showed that the total counts of bacterial cells by LIVE/DEAD BacLight staining were consistent with those by DAPI staining,and the average detection efficiency was（109 ± 29）%.The ratio of cell count with glutaraldehyde fixation to that without fixation was（106 ± 5）%on *** bacterial concentration in negative control was usually an order of magnitude lower than that in rainwater ***,in case of small precipitation,the abundance in negative control could be more than that in rainwater *** results indicate that the enumeration with LIVE/DEAD BacLight bacterial viability assay coupled with glutaraldehyde fixation and careful negative control investigation is an approach applicable to the measurement of the concentration and viability of bacterial cells in rainwater.

关键词： Bacterial abundance Viability Rainwater LIVE/DEAD BacLight stain Fluorescent enumeration

Numerical analysis of surface plasmons excited on a thin metal grating

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Journal of Zhejiang university-Science A(Applied Physics & Engineering) 2006年第1期7卷 55-70页

作者： OKUNO Yoichi SUYAMA Taikei Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan Department of Electrical and Computer Engineering Kumamoto University Kumamoto 860-8555 Japan

The authors numerically investigated the characteristics of surface plasmons excited on a thin metal grating placed in planer or conical mounting. After formulating the problem, the solution method, Yasuura＇s method （a modal expansion approach with least-squares boundary matching） was described. Although the grating is periodic in one direction, coupling between TE and TM waves Occurs because arbitrary incidence is assumed. This requires the employment of both TE and TM vector modal functions in the analysis. Numerical computations showed：（l） the excitation of surface plasmons with total or partial absorption of incident light; （2） the resonance character of the coefficient of an evanescent order that couples the plasmon surface wave; （3） the field profile and Poynting＇s vector. The plasmons excited on the surfaces of a thin metal grating are classified into three types： SISP, SRSP, and LRSP, different from each other in the feature of field profile and energy flow. In addition, the eigenvalue of a plasmon mode was obtained by solving a sequence of diffraction problems with complex-valued angles of incidence and using the quasi-Newton algorithm to predict the real angle of incidence at which the absorption occurs.

关键词： Thin metal grating Plasmon modes Resonance absorption Numerical analysis

Numerical Simulation of Deflecting Flow in a Symmetric Enlarged Channel

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Journal of Thermal Science 2007年第4期16卷 353-359页

作者： HiroyukiYOSHIKAWA MizueMUNEKATA HidekiOHBA Kazuyoshi ICHINOMIYA Department of Mechanical System Engineering Kumamoto University2-39-1 KurokamiKumamoto860-8555 Japan Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiKumamoto860-8555 Japan

Numerical results of three-dimensional separated flow and heat transfer in a rectangular channel with a sudden expansion are presented in this paper. Numerical simulations of Navier-Stokes and energy equations are carried out using the finite difference method. The results of three-dimensional calculations are compared with the two-dimensional ones, and effects of the aspect ratio of channel upon the flow are shown. The transition from symmetric to asymmetric flow appears at lower Reynolds number as increasing the aspect ratio. The details of local heat transfer characteristics in two different separated flow regions on two downstream walls are clarified. Two-dimensionality of the flow and heat transfer almost disappears for the aspect ratio considered.

关键词： Separated and reattached flow symmetric enlarged channel deflecting flow heat transfer

Dynamic interplay between viral adaptation and immune recognition during HIV-1 infection

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Protein & Cell 2010年第6期1卷 514-519页

作者： Chihiro Motozono Philip Mwimanzi Takamasa Ueno Center for AIDS Research Kumamoto UniversityKumamoto 860-0811Japan

Untreated human immunodeficiency virus(HIV)infections usually lead to death from AIDS,although the rate of the disease progression varies widely among *** cytotoxic T lymphocyte(CTL)response,which is restricted by highly polymorphic MHC class I alleles,plays a central role in controlling HIV *** is now recognized that the antiviral efficacy of CTLs at the single cell level is dependent on their antigen specificity and is important in determining the quality of host response to viruses so that the individual will remain ***,because of the extreme mutational plasticity of HIV,HIV-specific CTL responses are continuously and dynamically *** order to rationally design an effective vaccine,the questions as to what constitutes an effective antiviral CTL response and what characterizes a potent antigenic peptide to induce such responses are becoming highlighted as needing to be answered.

关键词： HIV/AIDS peptide-MHC complex HLA class I cytotoxic T lymphocyte immune escape

Effects of Pulsation on Separated Flow and Heat Transfer in Enlarged Channel

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Journal of Thermal Science 2011年第1期20卷 70-75页

作者： Hiroyuki YOSHIKAWA Tomonori KAI Mizue MUNEKATA Hideki OHBA Dept.of Mechanical System Engineering Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Kikuyo KikuchiKumamoto 869-1101Japan

Numerical results of three-dimensional separated flow and heat transfer in an enlarged rectangular channel are presented in this *** expansion ratio and aspect ratio of the channel are 2.0 and 16.0,*** number of the flow is 200 and it is over the critical Reynolds *** the critical Reynolds number,the flow in the symmetric channel becomes asymmetric and deflects to one side of the *** of the pulsating fluctuation at the inlet upon the flow in the channel are *** is clarified that the inlet flow with a pulsating fluctuation of Strouhal number 0.05 and 0.10 strongly affects on the flow in the channel,and heat transfer on the walls is enhanced,especially on the wall surface covered with long separation *** the other hand,the pulsation of St=0.0125 oscillates the shear layer more weakly than that of St=0.05,0.10 and the enhancement of heat transfer is smaller,though some vortices are shed from the vicinity of the side wall near the reattachment *** oscillation of the main flow calms down gradually as the Strouhal number of the pulsation increases over *** influence of pulsation of St=0.20 on the flow is restricted in the near downstream of the step,and heat transfer on the walls is almost similar to that of the steady flow in the channel.

关键词： Pulsating Fluctuation Symmetric Enlarged Channel Separated Flow Heat Transfer

Influences of the Exhaust Flow on the Boundary Layer Flow on the Wafer Surface in Spin Coating System

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Journal of Thermal Science 2005年第2期14卷 130-135页

作者： Seiichi KIMURA Mizue MUNEKATA Hiroaki KURISHIMA Kazuyoshi MATSUZAKI Hideki OHBA Graduate School of Science and Technology kumamoto university Mechanical Engineering and Materials Science Kumamoto UniversityTokyo Electron Kyushu LTDTokyo Electron AT LTDMechanical Engineering and Materials Science Kumamoto University

Recently, development of high technology has been required for the formation of thin uniform film in manufacturing processes of semiconductor as the semiconductor become more sophisticated. Spin coating is usually used for spreading photoresist on a wafer surface. However, since rotating speed of the disk is very high in spin coating, the dropped resist scatters outward and reattaches to the film surface. So, the scattered resist is removed by the exhaust flow generated at the gap between the wafer edge and the catch cup. It is seriously concerned that the stripes called Ekman spiral vortices appears on the disk in the case of high rotating speed and the film thickness increases near the wafer edge in the case of low rotating speed, because it prevent the formation of uniform film. The purpose of this study is to make clear the generation mechanism of Ekman spiral vortices and the influence of exhaust flow on it Moreover the influence of the catch cup geometry on the wafer surface boundary layer flow is investigated.

关键词： rotating disk flow spin coating boundary layer flow hot-wire measurement

Characteristics of Transient Vortices in the Boundary Layer on a Rotating Disk under Orbital Motion

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Journal of Thermal Science 2013年第6期22卷 600-605页

作者： Mizue Munekata Naoya Jobi Keiichiro Kubo Hiroyuki Yoshikawa Department of Mechanical System Engineering Kumamoto University

The objective of this study is to experimentally examine the characteristics of transient vortices in the boundary layer on a disk undergoing both rotation and orbital motion. The velocity fluctuations on a rotating, orbiting disk （disk radius equal to orbital radius） are measured by the hot-wire method, and the effects of orbital motion on the transient vortices in the boundary layer are examined. When the ratio of the orbital speed to the speed of rotation is i-0.025, the interval of transient vortices depends on only the orbital radius, regardless of the directions of rota- tion and orbital motion. The rate of low-frequency disturbances increases as the orbital speed increases, and the vortices induced by these low-frequency disturbances travel over the disk and then develop in the region of in- creased velocity. Consequently, no vortices generated on a rotating disk under orbital motion are stationary rela- tive to the disk.

关键词： Boundary layer transition Transient vortex Rotating disk Velocity measurement Hot-wire ane-mometer