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Published: September 04, 2004
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Article type: Appendix
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Daisuke YAJIMA, Osamu MOCHIZUKI
Article type: Article
Session ID: 1301
Published: September 04, 2004
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Object of this study is to realize a flight of a Bug Plane (BP) that is a small size flyer similar to the dragon fly. We test the flight of three different types of BP in different conditions' three types are distinguished by the position of the end plate. We used the auto rotation of a rectangular thin plate as the flight mechanism. The flight performance is evaluated by the distance between the landing and detached points. It is found that the end plate effect the flight performance and rotating speed of the wing depends on the fluid speed. The lift force is 40.3×10^<-4>N in this experiment.
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Shigeru SUNADA, Hiroshi TOKUTAKE, Atsushi Matsue, Wataru Hirosue
Article type: Article
Session ID: 1302
Published: September 04, 2004
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Akiyoshi IIDA, Shinichi JIDA
Article type: Article
Session ID: 1303
Published: September 04, 2004
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The aim of this investigation is to develop a micro air vehicle (MAV) for rescue inquiry devices. In order to inquire the disaster area, MAV requires hovering flight. To understand the hovering flight of insect, flow pattern of a flapping machine was visualized by using the PFV measurement and numerical simulation. PIV measurements were carried out with a sinusoidal flapping machine which was 10 times expanding model of real insects. The experimental result showed a leading-edge vortex can be captured around a flapping airfoil. The numerical results were good agreement with experimental ones. The lifting force of sinusoidal flapping is not enough to lift an insect itself. However, numerical result showed flapping motion with feathering generate large lifting force, it is enough to lift the insect. Therefore, feathering motion is key technology for development hovering flight MAV.
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Yohei MUTO, Hiromu SUGIYAMA, Kazuhide MIZOBATA, Ryojiro MINATO, Liquin ...
Article type: Article
Session ID: 1304
Published: September 04, 2004
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This paper describes an experimental study on the supersonic internal flows with Pseudo-Shock Waves (PSW) in a straight square duct with cross section of 80×80mm^2, using the pressure-vacuum type Mach 4 supersonic wind tunnel of Muroran Institute of Technology. The free stream Mach number and unit Reynolds number just upstream of the PSW were M_∞ = 3.98, Re_∞ = 2.6×10^7. Flow structure of the Mach 4 PSW was clarified by color schlieren photographs and the wall surface shear stress was visualized qualitatively by Shear-Sensitive Liquid Crystal. It. reveals that the turbulent boundary layer on the top or bottom wall of the duct separates in large just after the first shock wave of the PSW, and the internal flow of the PSW becomes asymmetric flow.
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Masahiro AMANO, Minho HAN, Tsuyosi KUMASAKA, Kaname KAWATSU, Goro MASU ...
Article type: Article
Session ID: 1305
Published: September 04, 2004
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In order to simulate the scramjet combustor, we tried to produce pseudo-shock waves (PSW) in a duct with 2° diverging angle with Plasma jet (PJ) torches which added heat to the supersonic flow because PSW is produced by heat release of combustion. And we compared the wall pressures and schlieren photographs of the diverging duct with these of the constant cross-section duct. And we considered the correlation of the location of PSW with total input powers. We confirmed what differences appear between the diverging duct with the constant cross-section duct.
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Hiroyuki HIRAHARA, Masaaki KAWAHASHI, Kerry HOURIGAN
Article type: Article
Session ID: 1306
Published: September 04, 2004
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The acoustic and fluid dynamic resonance in a two-dimensional cavity flow was investigated experimentally. In order to visualize a periodic oscillation of the shear layer and the behavior of vortices, a schlieren method was engaged with an ordinary CCD camera and high-speed video cameras. Particle image velocimetry (PIV) measurement was also carried out to obtain the vorticity distribution during the oscillation of the cavity flow. Shedding and interaction of vortices in the shear layer were observed near the trailing edge of the cavity, which causes the generation of pressure waves. The feedback process of the oscillation was determined using high-speed camera images. From these results, the oscillation cycle was indicated in an x-t diagram. From the x-t diagram, Rissiter's integers in his formula were determined. The result obtained PIV measurement show the outgoing and incoming flow neat the trailing edge of the cavity. It was confirmed that the fluid dynamic instability due to the shear layer caused a large mass flow near the trailing edge.
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Daisuke ONO, Taro HANDA, Mitsuharu MASUDA, Kazuyasu MATSUO
Article type: Article
Session ID: 1307
Published: September 04, 2004
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Three-dimensional unsteady behaviors of a supersonic cavity flow are investigated by the numerical simulation based on the Navier-Stokes equations; The resulting time-dependent solutions are phase-averaged on the dominant frequency. As a result, the standing wave in the cavity and vortex-shedding are found to be highly three-dimensional.
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Masashi KASHITANI, Yutaka YAMAGUCHI
Article type: Article
Session ID: 1308
Published: September 04, 2004
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The focusing system can visualize the three-dimensional flow field. It is the attractive visualization method in the high speed wind tunnel testing. In the present study, a focusing system was designed with referring to the Weinsten's system to visualize the shock tube airfoil flow. Also the measurement gauge was developed to investigate the visualization characteristics of this system. As a first step, we investigated the resolution at the focus location of the test section, and the visualization around a double wedge airfoil model was performed by this system.
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Hiroshi KATANODA, Takeshi MATSUOKA, Seiji KURODA, Jin KAWAKITA, Hirota ...
Article type: Article
Session ID: 1309
Published: September 04, 2004
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This paper investigates flow patterns inside and outside the high-velocity oxy-fuel (HVOF) thermal spraying gun by aerodynamic experiments and one-dimensional analysis including wall friction (Fanno flow). In the experiments, static pressure along the barrel inner-wall is measured and schlieren pictures of jet discharged from the barrel exit are taken. The flow-fields predicted by the present simple analysis agree well with the experimental results. The present work shows that flow patterns of HVOF gun in operation depends on the stagnation pressure and barrel length.
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Mi Young LEE, Tetuya KAWAMURA, Kunio KUWAHARA
Article type: Article
Session ID: 1310
Published: September 04, 2004
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In order to understand shock wave in a vortex dominant flow, we have presented simulation and visualization of supersonic impinging jet flows. We applied the MUSCL TVD scheme to convection terms and 2nd-order centered difference scheme for viscosity terms. And we used Cartesian coordinate system at equal intervals. Cartesian grids make grid generation time short and the process simple. By numerical results, we showed clearly image of a supersonic impinging jet and interaction of shock wave and vortex.
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Masanori TANAKA, Shigeru MATSUO, Toshiaki SETOGUCHI, Kenji KANEKO
Article type: Article
Session ID: 1311
Published: September 04, 2004
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Many studies on the propagation of the unsteady expansion wave in a pipe with area changes have been performed. However, there are a few studies on the interaction of the unsteady expansion wave with orifices in a pipe. This study is very important from a viewpoint of not only mechanical application but also for basic research in gasdynamics. In the present study, a computational fluid dynamics work was applied to clarify the effect of non-equilibrium condensation on compressible flows in an expansion tube with one or two orifices, and the time - dependent flow properties were discussed based upon the present computational results. As a result, it is clarified that the compressible flow around the orifice is strongly influenced by the non-equilibrium condensation.
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Mitsuhiro NADACHI, Kazuhide MIZOBATA, Hiromu SUGIYAMA
Article type: Article
Session ID: 1312
Published: September 04, 2004
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This study aims to design and experimental construct a small-scale supersonic/hypersonic ground test facility. The Ludwieg tube can generate calm flows with Mach and large Reynolds numbers corresponding to the real flight conditions, with sufficiently long duration for flow field settling and measurements, and without shocks and pressure disturbances. Its flow characteristics are predicted by quasi-one-dimensional analysis, and several design points are selected. Its primary components, such as high-pressure reservoir tubes, a high-speed opening valve, and contoured nozzles, are designed, fabricated and assembled. In preliminary runs, moderately calm supersonic flows, overexpanded slightly, are realized. The steady-state pressure at the reservoir tubes agrees well with the theoretical value and the duration of the pressure plateau is about 50milliseconds.
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Shigeru MATSUO, Masanori TANAKA, Toshiaki SETOGUCHI, Kenji KANEKO
Article type: Article
Session ID: 1313
Published: September 04, 2004
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A rapid expansion of moist air or steam in a supersonic nozzle gives rise to non-equilibrium condensation. If the latent heat released by condensation exceeds a certain quantity, the flow becomes unstable and a periodic flow oscillation occurs. In the present study, a numerical simulation of moist air flows in a supersonic nozzle was carried out using a special short duration supersonic wind tunnel, called a Ludwieg tube. In cases of nozzles with large throat height, the effects of initial relative humidity of the moist air on the flow field have been shown numerically. As a result, it was found that the characteristics of flow with occurrence of condensation were grouped into three classes.
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Toshiyuki AOKI, Shinichiro NAKAO, Nobuaki KONDOH, [in Japanese]
Article type: Article
Session ID: 1314
Published: September 04, 2004
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Yoshiaki MIYAZATO, Yong-Hum KWEON, Toshiyuki AOKI, Toshiaki SETOGUCHI, ...
Article type: Article
Session ID: 1315
Published: September 04, 2004
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The effect of nozzle-lip thickness on supersonic jet noise generated from Laval nozzle with a design Mach number 2.0 was experimentally investigated using acoustic measurement and flow visualization. Experiments were carried out over a wide range of the nozzle pressure ratio from 2.0 to 18.0. The obtained results show that the nozzle-lip thickness significantly influences the acoustic characteristics of supersonic jet noise, such as jet oscillation mode, screech tone intensity and overall sound pressure level.
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Minoru Yaga, Toshio Takiya, Yasushi Iwata
Article type: Article
Session ID: 1316
Published: September 04, 2004
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A numerical simulation solving the axi-symmetrical Navier-Stokes equations for the gas flow inside of an elliptical model was performed, in which supersonic jets are emitted into the elliptical cell forming propagating shock waves. The shock waves reflect on the wall of the elliptical cell and focus on the focal point. In the calculations, the effect of the jet duration, the jet Mach numbers, and the exit height of the elliptical cell mainly on velocities near the exit and outside of the cell are investigated. As the result, it was found that the variations of the velocity at the cell exit are attenuated by the cell itself during the process of the propagation of the pressure waves. The attenuation of the velocity variations is observed outside of the cell showing the gradual variations. Also there is the optimum height of the exit that affects the reflected shock waves focusing at the focal point of the cell.
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Tsuyoshi YASUNOBU, Hideo KASHIMURA, Toshiaki SETOGUCHI
Article type: Article
Session ID: 1317
Published: September 04, 2004
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The numerical investigation for the reflection of propagating expansion wave on the ellipsoid surface is carried out in this study. This paper aims to clear the reflecting process and the focusing phenomenon of expansion wave and the characteristic of pressure change caused by reflection of expansion wave on the ellipsoid surface using the PLM numerical method. From the results of numerical analysis, it is concluded that the pressure change and the pressure gradient depend on the initial length of expansion wave and the curvature of ellipsoid surface.
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Akihiko YAMASHITA, Hiromu SUGIYAMA, Kazuhide MIZOBATA, Ryojiro MINATO, ...
Article type: Article
Session ID: 1318
Published: September 04, 2004
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Shock wave propagation and collapse of gas bubbles caused by a shock in a water containing gas bubbles are of large interest in relation to characteristics of water hammer, blowdown of high pressure liquids in pipes, etc. The large-amplitude shock wave propagations in the bubbly liquids are investigated using a two-phase shock tube. Effects of incident shock wave strength on shock wave pressure characteristics are clarified. Behavior of the bubbles collapsing behind large-amplitude shock waves is also clarified by pressure history measurements and high speed photography.
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Kiyonobu Ohtani, Hiroaki Yamamoto, Tsutomu Saito, Kazuyoshi Takayama
Article type: Article
Session ID: 1319
Published: September 04, 2004
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This paper reports the results of experimental results of shock wave/ bubble interaction in a highly viscous liquid. In the medical applications of the shock waves, it is necessary to consider the viscous effect of water. The magma fragmentation is considered to be one of the major mechanisms of the explosive-type volcano eruptions. The dynamic motion of magma should be experimentally investigated from the view point of shock wave dynamics. Silver azide pellet was exploded in silicone oil and starch syrup with various viscosity was visualized by shadowgraph using high speed video camera.
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M. Sun, M. Komazu, T. Saito, K. Takayama
Article type: Article
Session ID: 1320
Published: September 04, 2004
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This paper reports our progress in the development of a numerical method to simulate the hydrodynamic phenomenon induced by a focused laser beam in water. As the first step, the present work is to construct a general conservative front capturing method for multi-fluids. The idea is to evaluate numerical fluxes on a fixed mesh but taking into account the interaction between the material interface in the cell and the waves initiated from cell interface. A 1-D dimensional numerical test is reported.
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S. H. R. Hosseini, S. Moosavi-Nejad, T. Saito, K. Takayama
Article type: Article
Session ID: 1321
Published: September 04, 2004
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The present research aims to study underwater shock wave propagation and attenuation in tissue models to understand mechanisms of tissue damages during shock wave therapies. In order to simulate interaction of shock waves with intercellular structures, thin porous layers of cotton immersed in water were exposed to underwater shock waves. Shock waves were generated by explosion of 10 mg silver azide pellets, which were ignited by irradiation of a pulsed Nd:YAG laser beam. Peak overpressures were measured with hydrophones at various stand-off distances. The motion of shock waves was quantitatively visualized by using double exposure holographic interferometry.
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Toshihiko IKEDA, Akihisa ABE, Hideki KAWASAKI, Haruo MIMURA, Ryo KATAK ...
Article type: Article
Session ID: 1322
Published: September 04, 2004
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In the present study we carry out the gas gun experiment and the numerical simulation to investigate the lethal effect of shock waves to a marine microorganism and behavior of waves in target containers. The marine Vibrio sp. that is isolated from ship's ballast water is used. After the impact, Vibrio sp. is cultivated for 24 hours at 30 degrees. The shock pressure effect is judged by the number of colony in agar plates. The pressure in a container is measured by the piezo-electric film gauge. We can get 2.5 kbars shock pressure in a small type container and realize 99.99% of lethal rate. On the other hand, the pressure propagation phenomena in the container are calculated by the LS-DYNA. From the comparison between experimental result and numerical one we examine the generation process of high pressure in the container.
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Takeshi HINATA, Hirofumi IYAMA, Shigeru ITOH
Article type: Article
Session ID: 1323
Published: September 04, 2004
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The shock forming method is one of the material processing methods. In this method, the shock wave generated by the explosion and propagated through a suitable pressure medium like as a water or air act on a metal plate, a metal tube, etc. It gives a very high strain deformation of the material and finally a suitable plastic deformation. This method is called as a shock bulge forming. The advantages of this method are hard to produce the spring back and a high strain rate material processing. The material processing at high strain rate leads an extreme high deformability of the aluminum base alloys. The predominance of shock bulge forming is investigated by comparing with static press bulge forming.
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Shiro Sakai, Hiroshi Mizunuma
Article type: Article
Session ID: 1324
Published: September 04, 2004
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The mechanical damage of red blood cells was investigated using osmotic swelling. The swollen red cell ejected hemoglobin solution through the micro pore opened on the membrane. The hemoglobin jet into the suspending fluid was visualized using polystyrene microspheres. The time for the hemoglobin ejection was found to be about 20 s. Assuming the diameter of the micropore to be 1μm, the pressure inside the red cell was estimated. This inner pressure and the macroscopic elastic model for the red cel membrane enabled the computer simulation for the red cell swelling from normal cell shape.
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Tomoyuki SHIGA, Satoyuki KAWANO
Article type: Article
Session ID: 1325
Published: September 04, 2004
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In the recent bionano technology, DNA has considerable attention because it can be used as the materials for novel electronic device due to the π stacking between the base pairs. It was found experimentally that the poly(dA)-poly(dT) DNA is the n type semiconductor and poly(dG)-poly(dC) DNA is the p type one. To obtain the basic design data for the bionano electronics devices by the use of DNA, the mechanical properties such as elasticity should be obtained in detail. Experimental investigation seems to be difficult and the effective computer simulation technique to obtain the practical data described above is strongly required. In the present study, the novel force field for molecular dynamics simulation of macromolecules applicable for its large deformation is developed and the DNA extension characteristics by external force is discussed in detail. The results are compared with the previous work.
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Kenichiro KOSHIYAMA, Tetsuya KODAMA, Takeru YANO, Shigeo FUJIKAWA
Article type: Article
Session ID: 1326
Published: September 04, 2004
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Cell permeabilization using shock waves may be a promising way of introducing macromolecules and small polar molecules into the cytoplasm and may have applications in gene therapy and anticancer drug delivery. The detailed mechanism of the cell permeabilization however is still unclear. To investigate the mechanism, we have performed molecular dynamics (MD) simulations of the interaction of the shock wave impulse with a lipid-bilayer. The MD simulation determined the relationship between the uptake of water molecules into the lipid bilayer and the impulse. The interaction of a shock wave with a lipid bilayer induced a structural change of the bilayer and subsequently increased the fluidity of each molecule. These changes in the bilayer may be an important factor for the mechanism of cell permeabilization using shock waves.
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K. Nishiyama, T. Watanabe, T. Hoshino, I. Ohdomari
Article type: Article
Session ID: 1327
Published: September 04, 2004
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By investigating the interactions between Green Fluorescent Protein (GFP) and Si substrates using molecular dynamics simulation, we got the following results. GFP adsorbs on the hydrophobic substrate directly, and on the hydrophilic substrate via water molecules. GFP-hydrophobic substrate attractions are stronger than GFP-hydrophilic substrate attractions. Flexibility of GFP is reduced when GFP adsorbs on the Si substrate.
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Takashi Misaka, Satoyuki Kawano
Article type: Article
Session ID: 1328
Published: September 04, 2004
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Nonthermal atomospheric-pressure oxygen plasma is modeled in two-dimensional cross-sectional region and plasma discharge characteristics are analyzed by numerical simulations based on finite difference method. Plasma simulation code for discharge in plasma display panel (PDP) cell is applied to the simulation of oxygen plasma in decontamination reactor. Discharge characteristics in the PDP cell are dielectric barrier discharge, and it must be the effective for plasma discharge sterilization process. Micro-control technology of plasma flow in the PDP cell is potentially applicable for the manipulation of the cells of microorganisms. Distribution and time history of atomic oxygen and metastable molecular number density are numerically obtained.
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Takehiko SATO, Akiko Doi, Hideya Nishiyama, Kazunari Fujioka, Raju Ram ...
Article type: Article
Session ID: 1329
Published: September 04, 2004
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A new type of atmospheric low temperature plasma source was developed utilizing a coaxial cable for microwave transmission rather than conventionally used waveguides. The plasma source has advantages such as portability, simple configuration, and ability to operate with wide range of gases and its mixtures. It mainly consists of a cavity, a quartz discharge tube, a coaxial cable, a microwave power source and a gas supply system. Using this plasma source, we tried to clarify sterilization characteristics of Bacillus subtilis. The log reduction numbers of Bacillus subtilis was obtained at least 5 (10^<-5>) under the following operation conditions: gas flow rates of Ar (14 SLM) with mixing oxygen of 0.5 SLM and input power is 400 W. Distributions of temperature and gas velocity were also measured two-dimensionally by using E-type thermocouple and Pilot tube, respectively. The temperature distributions and the peak value of temperature were influenced by the gas flow rate and the kinds of mixing gas. The effective sterilization is obtained under the condition of the substrate surface temperature of 353 K.
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Youhei MARUYAMA, Satoyuki KAWANO
Article type: Article
Session ID: 1330
Published: September 04, 2004
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Charge transport in deoxyribonucleic acid (DNA) is important because of the practical use of DNA in nanoscale electronic devices and the investigation of long-range effect of radiation damage for human body. The mathematical model for charge transport in DNA was reported by S. Komineas et al. In our own numerical code based on implicit SOR scheme, the scheme for time-dependent Schrodinger equation developed by N. Watanabe et al. is applied in order to improve conservation of the norm of the wavefunctioh. From these results, we accumulate the understanding of the charge transport phenomena in DNA.
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Taisuke SUGII, Shu TAKAGI, Yoichiro MATSUMOTO
Article type: Article
Session ID: 1331
Published: September 04, 2004
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Bilayers formed from lipid molecules are studied using Molecular Dynamics (MD) method and Dissipative Particle Dynamics (DPD) method, which is recently proposed to simulate mesoscopic phenomena. We carried out a long time MD simulation up to 10 ns and a DPD lipid model is proposed using the MD results. Then the number density profiles of the coarse grained segments of MD and DPD beads are compared and we obtained reasonable agreement between the results of two methods. Furthermore, we investigated the dynamical property of lipid molecules, and the lateral diffusion coefficients of both methods agreed with an experimental.data and a MD simulation result. These results indicate that the intra molecule potentials such as bond or angle potential as well as the inter particle potential play an important role in an achievement of more 'realistic' DPD lipid membrane correspond to MD simulations.
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Session ID: 1332
Published: September 04, 2004
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Capsules like a red blood cells change their shapes in response to the local flow conditions in a capillary. In the present study, giant vesicles (GVs) are investigated as one of the simple models for bio-membrane capsules. Immersed-Boundary method was used to simulate these deformable GVs. At first, we expressed a GV model with the fluidity of membrane taken into account. Then, we analyzed the dependence on the parameter dominating the deformation of a GV in a 2-D Poisuille flow. As the last example, we conducted the 3-D numerical simulation of GVs and succeeded in showing 3-D GV deformed to a parachute shape in a rectangular capillary channel.
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Yasuhiro Inoue, Shu Takagi, Yoichiro Matsumoto
Article type: Article
Session ID: 1333
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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We have been studying complex phenomena on flows of vesicles suspending to blood in micro circulations. In this paper, the distribution of vesicles at an orthogonal bifurcation is investigated in terms of numerical simulations by using real-coded lattice gas model, and we study its dependency on both the concentration of vesicles in the mother vessel and the diameter-ratio between two daughter vessels. Focusing on the ratio between the number of vesicles at each bifurcated vessel, it obeys the function of the third power of diameter-ratio of two daughters except the small diameter-ratio case. This might indicate that the flow ratio between two daughters would be the main physics on the dividing concentration of vesicles at the bifurcation.
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Hirofumi SHINTAKU, Satoyuki KAWANO, Isaku KANNO, Hidetoshi KOTERA
Article type: Article
Session ID: 1334
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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Mixing of samples and reagents in microchannels is a key technology in realizing a μTAS. Turbulence is not practically attainable in micro-scale since Reynolds number is extremely low. Therefore, introducing oscillations or electrical force to disturb liquid flow is necessary to enhance the mixing in microchannels. Some researchers reported mixing method by the use of time pulsating cross-flow into main channel. In those systems, complex actuators are necessary and the efficiency is not so high due to the difficulties in the optimization. In this paper, we present a simple mixing method using an asymmetric pulsating flow.
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Hirofumi SHINTAKU, Satoyuki KAWANO, Yusuke YAMAJI, Isaku KANNO, Hideto ...
Article type: Article
Session ID: 1335
Published: September 04, 2004
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Picoliter-sized water droplets are generated for liquid metering system of μTAS using liquid-liquid interface. The dynamics of interfacial wave between two immiscible liquids has an important roll in this system, e.g., controlling droplets size. In this paper, the fluid dynamical study based on the interfacial instability theory is carried out. Comparing experimental and theoretical results, the validity of theoretical approach is discussed in detail.
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Lei LIU, Satoyuki KAWANO, Shunsuke SHIMIZU, Tomoyuki MORITA, Hirokuni ...
Article type: Article
Session ID: 1336
Published: September 04, 2004
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In bio-engineering field, the micro-scale systems, such as μTAS, attract our interest for the purpose of the improvement of efficiency of bio-chemical analysis and miniaturization of the equipment by integrating micro fluidics elements on a micro-chip. However, mixing reagent solutions each other is difficult in those systems because of extremely low Reynolds number. Moreover, a DNA sample in the solution behaves in the nano-scale, which is smaller than micro-scale, so that it is difficult to control both reagent concentration and DNA behavior properly. In this study, we calculated the electroosmotic flow with reversed flow in micro-channel by means of 2D NS equations and evaluated the effect of the reversed flow on the diffusion phenomena, and mixing condition of a DNA sample into the solution is numerically predicted by modeling the DNA with MD method and coupling the model with the calculated flow.
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Yuichiro IMAI, Kazuma TAKENAKA, Hidehiro OANA, Masao WASHIZU
Article type: Article
Session ID: 1337
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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We developed the intracellular network analysis system based on a fine processing technology. A single, or multiple micro orifices, ca. 1μm in diameter was microfabricated on a SiO_2 plate of 1μm thickness with an ultra violet laser. A cell was trapped onto it by a hydrodynamic suction and ruptured with an ultraviolet laser or an infrared laser to expose the interior. We also examined an applicability of this system to a patch clamp method. For the patch clamp, a smooth edge of an orifice is important to prevent a leakage current. A orifice with smooth edge was made using a focused ion beam. Using this orifice, the high-resistance seal, i.e., gigaseal, was achieved.
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Daisuke YAMADA, Yoshifumi OGAMI, Yasunari TAKANO
Article type: Article
Session ID: 1338
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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Bacteria swim to the better environments with the thrust produced by a rotating helical flagellum. The mechanism of swimming bacteria has been studied for the application to micro machines such as medical micro chips. We simulate the phenomenon of a swimming bacterium with the aid of a commercial software, CFX4, and analyze the mechanism by estimating the pressure, friction and moment acting on the bacterium. The effective ratio of the rotation speeds of the body and of the helical flagellum of the bacterium, and the relation between the rotation speed of the flagellum and thrust are found out. The results will be useful for designing a micro machine moving with a rotating helical flagellum.
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Yasumasa ICHIKAWA, Hiroaki ONOE, Yuushi Yamada, Isao SIMOYAMA
Article type: Article
Session ID: 1339
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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The organismal multiphase flow in a micro channel have been complicated by the interaction of the circumference fluid and the mixed organismal component, the micro characteristic of the organismal multi-phase flow was studied in the flow with the liposome which is the artificial organismal component. The flow in the channel of which the parent hydrophobic of the wall surface was controlled is observed, and it is shown that the flow characteristics are changed by the wall surface condition.
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Yoshihiro MINO, Kenji SHIMOKASA, Hiroshi MIZUNUMA
Article type: Article
Session ID: 1340
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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It is known that elderly people's pneumonia caused by swallowing disorder contains high danger of death. However, there is no medical instrument to detect the aspiration. Here, we applied ultrasonic 2-D images and some care foods for patients to detect the aspiration. Three care foods used here were jerry, yogurt, and moose-up. The clear ultrasonic 2-D images were obtained for moose-up. The moose-up was prepared by mixing soluble powder and liquid, and the mixture had high viscosity and ununiformity of density. The results obtained here suggested that the ultrasonic 2-D images for the viscous liquid care foods would enable the detection of aspiration.
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Tomoyuki OHKUBO, Yasushi TAKEDA, Michitugu MORI, Hideaki TEZUKA
Article type: Article
Session ID: 1341
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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Measurments of foods flow field is very important for sanitary and prpductivity control. In generally, it is difficult on account of opaque liquid. Milk is representative it. In this paper, it was proposed new foods mesurment technique which is used Ultrasonic Doppler Method. In the biginning, it was investigated milk sound velocity which is 1526 m/s by Pulse-echo Time of Flight Method. Thereafter, it was mearsured velocity distribution in milk pipe flow. It was confirmed effectiveness of new one. Further more, it was indicated points to notice for foods flow measurement.
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Akiko FUJIWARA, Kazuhiro WATANABE, Shu TAKAGI, Yoichiro MATSUMOTO
Article type: Article
Session ID: 1342
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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Micro-bubble generation technique by using converging-diverging nozzle (venturi tube) is introduced. Rapid pressure recovery in the diverging nozzle induced bubble fission. The purpose of this study is to clarify the mechanism of the bubble breakup process in the venturi tube depending on the bubble volume in the nozzle. The phenomena of the bubble breakup or fission were observed in detail by using high-speed camera. The bubble breakup processes are classified into three types. The difference of them depended on the maximum volume of the bubbles after its expansion.
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Takao HOZUMI, Soichiro KAWAGUCHI, Hiroyuki TAKAHIRA
Article type: Article
Session ID: 1343
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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The motion of a microbubble in a shear flow was observed using a high-speed camera. The shear was imposed on the bubble that was initially trapped in a narrow channel with the laser trapping technique. It was shown that as the radius of a microbubble became small, the bubble escaped from the laser trap being more repelled by the optical force. The vibratory translation, which was induced by the rotation of the laser cone, was observed when the bubble was inside the laser cone. The experiments were compared with the theoretical predictions. The theoretical predictions were qualitatively in good agreement with the experiments.
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Manabu TANGE, Shu TAKAGI, Makoto WATANABE, Masahiro SHOJI
Article type: Article
Session ID: 1344
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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This paper reports an experimental investigation of "Microbubble Emission Boiling (MEB)" in a microchannel. The microchannel is 50 mm in length including heated length 20 mm, 1 mm in width and, 200 μm and 1000 μm in height. MEB in microchannel realized high heat flux over 4.5 MW/m^2 with low flow rate of 20 cc/min and low pressure drop nearly equal to that of single phase condition. Under conditions of higher heat flux more than certain value, however, saturate boiling at downstream took place and fluctuated annular flow was observed. High speed video camera captured how vapor bubbles emit microbubbles in pool boiling system. An interface of a primary vapor bubble on the heated surface undulated and several microbubble were produced from the ripples without departure of the primary bubble.
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Shigeru TAKIKAWA, Kazunori WATANABE, Masahiro OTA
Article type: Article
Session ID: 1345
Published: September 04, 2004
Released on J-STAGE: August 01, 2017
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Induced flows in water droplet mixed fine solid particles and particles motion by laser irradiation are discussed in this paper. Laser trapping system for micro-sized objects was constructed. The system contains YAG laser and optical microscope. The flows and motion of the particles in water droplet on glass plate were occurred under the microscope by laser irradiation. The trapped particles near the bottom of the water droplet were forced from the outer boundary of trapping area to center of the area. The absorption should be effective for the high intensity laser power at a focal spot on glass plate while the absorption of the near infrared laser beam into the glass plate and water can be generally small as they have high transmissivity. A micro heat spot could be produced by the absorption of the laser beam, and heat transfer occurred from the heated glass plate to the water droplet with the particles. The local flow was induced by the heat transfer in the water droplet, and the induced motion of the particles was arisen by the effect of the flow.
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