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Article type: Cover
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Published: September 18, 2005
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Article type: Appendix
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Article type: Appendix
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Article type: Appendix
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Article type: Index
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Published: September 18, 2005
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Takashi WATANABE, Daisuke TAKAKUKRA, Ikuo NAKAMURA
Article type: Article
Session ID: 316
Published: September 18, 2005
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What structure of information does a student obtain when he or she learn fluid engineering? In this paper, undergraduate students who had learned physics at their high schools were recruited as subjects and knowledge structurs about fluid engineering were investigated. The problems used in experiment were textbook problems, and protocol analisys was adopted to clarify students' processes to solve the problems. While students who had not taken any fluid engineering course remembered their naive physics at their problem solving, students who had passed the course suggested that they had their own structural knowledge and used systematic ways to obtain solutions.
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Yasuhiro WATASHIBA, Koji SAKAI, Koji KOYAMADA, Masanori KANAZAWA
Article type: Article
Session ID: 317
Published: September 18, 2005
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We propose a similarity judgment method between critical point graphs (CPGs) in two volume data sets by using the directional element feature (DEF) that has been employed in the field of character recognition techniques (CRT). It becomes possible to perform classifying and searching volume data sets by using CPG with DEF. Critical Point (CP) shows the feature point of data, and CPG is a connection of those points by streamlines based on vector data of the field. Therefore, it is thought that CPG is an expression of the feature of volume data in a simple figure. CPG is consisted of curves and they are composed of small straight-line segments. Therefore, we applied extended DEF to the similarity judgment of CPG method.
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Susumu SHIRAYAMA
Article type: Article
Session ID: 318
Published: September 18, 2005
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Development of high-performance personal computing and the spread of broadband service may mean that a huge amount of data is produced from a personal site, and useful computational data is accumulated and distributed over personal sites. Owing to the volume of data, it is quite difficult to access such data even if using modern information technology. We have developed a new knowledge-intensive simulation system to overcome this issue. In this paper, we consider the characteristic feature of grid data. And then, a new method to retrieve a grid data will be proposed.
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Kozo FUJII, Atsuji OGASA, Takuji NAKAJIMA, Yoshiaki TAMURA, Mitsuhiro ...
Article type: Article
Session ID: 319
Published: September 18, 2005
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Vistrace is one kind of software that the present authors have recently developed as an interface software program connecting simulations on the server and visualizations on the client machine. The present paper describes good features and future possibility of the software VisTrace.
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Jin Ne LIM, Daisuke SASAKI, Shinkyu JEONG, Shigeru OBAYASHI
Article type: Article
Session ID: 320
Published: September 18, 2005
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In this paper, the effectiveness of the Fuzzy Decision Tree as a data mining technique for datasets obtained by Evolutionary Algorithms, which is a preferred optimization technique for multi-objective problems, is investigated. The Fuzzy Decision Tree is constructed to evaluate the influence of design variables on the objective functions. Based on the results of the Fuzzy Decision Tree, designers can reduce the number of design variables and focus on the important design variables. The technique is applied to the aerodynamic optimization of a supersonic wing design which has four objective functions and 72 design variables.
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Hikaru SHIBATA, Toshiyuki HAYASE
Article type: Article
Session ID: 321
Published: September 18, 2005
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It is difficult to obtain accurate and complete information of real flows by either numerical analysis or experimental measurement. Especially, determination of the pressure field in real flows is critically difficult problem. Hybrid wind tunnel integrating the numerical simulation and the measurement is possible solution to this problem, but has been investigated as off-line analysis tool. In this paper, we improved the hybrid wind tunnel system to obtain the accurate pressure, and to perform the real-time analysis. Karman vortex street behind a square cylinder was investigated with new system. Comparison between the measurement and the analysis for the pressure at feed back point shows good agreement.
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Makoto HAMANO, Hiroyuki FURUKAWA
Article type: Article
Session ID: 322
Published: September 18, 2005
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Taylor vortex flow appears between two concentric rotating cylinders, for example, fluid bearings of hard disks etc. It is important to investigate Taylor vortex flow in order to control flows. When the velocity of inner cylinder changes, the flow suddenly becomes unstable and develops into vortex flow having different number of cells. Cylinder torque applied to the cylinder walls and mean kinetic energy change sharply, leads to the deterioration and destruction of the container. In this study, the effects of cylinder length, angular velocity and, in particular, acceleration time of the inner cylinder, is examined in detail when cylinder length is almost identical to difference between the radii of inner and outer cylinders.
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Article type: Appendix
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Kazuyuki TAKASE, Hiroyuki YOSHIDA, Hajime AKIMOTO, Yasuo OSE, Takayuki ...
Article type: Article
Session ID: 324
Published: September 18, 2005
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In order to predict the water-vapor two-phase flow configurations in a fuel bundle of an advanced light water reactor, a large-scale numerical simulation was carried out using a newly developed two-phase flow analysis code and a highly parallel vector supercomputer. Conventional analysis methods need composition equations and empirical correlations based on the experimental data. In case that there are no experimental data for the advanced light water reactor, therefore, it is difficult to obtain high prediction accuracy. Then, a new two-phase flow analysis method based on the latest computational science was proposed. This paper describes the predicted bubbly flow behavior in a three-dimensional minichannel and the predicted void fractions in the simulated tight-lattice fuel bundle. Regarding the mechanism of bubble coalescence and fragmentation the useful knowledge was obtained.
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Jun ISHIMOTO, Hidehiro HOSHINA, Tadashi TSUCHIYAMA, Hideyuki WATANABE
Article type: Article
Session ID: 325
Published: September 18, 2005
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The 2-D and 3-D structure of liquid atomization behavior is numerically investigated and vizualized by the new type of integrated simulation technique. The present CFD analysis is focusing on the consecutive breakup of liquid column, formation of liquid film and droplets at the exit section of nozzle outlet. The governing equations for high-speed spray nozzle flow based on the LES-VOF model are presented, and then an integrateed parallel simulation are performed to clarify the detailed atomization process and to clarify the atomized droplets-gas two-phase flow characteristics.
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Yoshiyuki ISO, Kyoji KAMEMOTO
Article type: Article
Session ID: 407
Published: September 18, 2005
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We developed a special combination of vortex method and particle trajectory tracking method, which is applicable to internal unsteady two-phase flows. This method is a completely grid-free Lagrangian-Lagrangian simulation, which is able to simulate interactions between particles and fluid flow. In this study, internal liquid-solid two-phase flows in a mixing tee had been analyzed by the new method, in which use of vortex introduction model enables us to simulate dynamic behaviors of separation or reattachment vortices. We simulated and measured particle motions, such as deposition or particle-wall collision, which change according to confluent flow rate ratio in a mixing tee. Calculation results showed good agreements with this experimental data. The present method can be useful in the design of industrial multiphase flows.
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Makoto SATO, Mamoru TANAHASHI, Toshio MIYAUCHI
Article type: Article
Session ID: 408
Published: September 18, 2005
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Direct numerical simulations of evaporating droplets in homogeneous isotropic turbulence have been conducted to clarify the relationship between droplets dispersion and coherent fine scale eddies in turbulence. The motion of 10^6 droplets were analyzed for a several droplets Stokes number. The Stokes number that causes preferential distribution of droplets in turbulence is closely related to the coherent fine scale eddies. It is shown that the change of droplets diameter by evaporation influences droplets dispersion. The number density of droplets with particular Stokes number is low near the center of coherent fine scale eddies, and increase with distance from the center and reaches the maxima near 1.5 times of radius of coherent fine scale eddies.
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Yuya BABA, Fumiteru AKAMATSU
Article type: Article
Session ID: 409
Published: September 18, 2005
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CIP method and higher-order finite differernce method were introduced to simulate combuting multiphase flow. The both methods had advantages and shortcomings which were oriented in their characteristics. We revealed their characteristics in computational fluid dynamics and concluded that it was the best to combine the both methods. CCUP method was also adapted to overcome the instability in the simulation of compressible fluid flows and to be free from CFL regulation for speed of sound. Through the methods, we could simulate various combusting flow fields stably with a large time interval. We finally combined the method with large eddy simulation to simulate larger scale systems and to cooperate with experimental studies of multiphase combution.
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Yuichi ITOH, Nobuyuki Oshima
Article type: Article
Session ID: 410
Published: September 18, 2005
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A numerical simulation of a turbulent spray combustion flow is carried out to investigate feasibility of accurate computation for the spray combustion flows by using Large-Eddy Simulation (LES). An experimental database for a turbulent non-premixed spray flame is chosen to validate the present numerical simulation. The governing equations for the gas phases are discretized in a three-dimensional staggered grid system, and the fuel droplet motion equations are described in a Lagrangian representation. The flamelet approach is employed for a turbulent combustion model. A new thermal coupling model is proposed to estimate interaction between the gas-phase thermal energy and the dispersed-phase. The flame temperature drop caused by the thermal impact from the spray droplets is expressed properly by employing the thermal coupling model.
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Susumu Noda, Atsushi Oku, Kunihiko Yamamuro
Article type: Article
Session ID: 411
Published: September 18, 2005
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A moment method being able to handle detailed chemical kinetics has been developed in the context of presumed probability density functions (PDF). Temperature and composition are assumed to be independent statistically. Furthermore, both the PDFs are presumed as being the beta function distributions. The present method has been applied to a turbulent jet diffusion flame, which is opened as H3 flame on the international workshop on measurement and computation of turbulent non-premixed flames. It is found that the present method has a great potentiality, on the basis of the calculation result.
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Shinnosuke NISHIKI, Tatsuya HASEGAWA, Ryutaro HIMENO
Article type: Article
Session ID: 412
Published: September 18, 2005
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We have carried out the modeling based on DNS databases of the fully developed turbulent premixed flames in order to improve combustion models. On the way of development of modeling, the definition of the energy dissipation rate ε, which is very important for whole of modeling, was modified sometimes. The energy dissipation rate ε estimated with each definition showed the different distributions in the flame region. It is a future subject to examine details more to decide the definition of the most suitable and reasonable energy dissipation rate ε to improve the combustion models.
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Nobuhiro SHIWAKU, Mamoru TANAHASHI, Toshio MIYAUCHI
Article type: Article
Session ID: 413
Published: September 18, 2005
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Three-dimensional direct numerical simulation of hydrogen-air turbulent premixed flame has been conducted to develop and verify SGS combustion model for turbulent premixed flames. The conventional SGS combustion model, which represents the SGS turbulent burning velocity as a monotonically increasing function with respect to SGS turbulence intensity, fails to represent the filtered DNS data. SGS flame surface area of turbulent premixed flame is hardly approximated by the function of SGS turbulence intensity, and shows strong correlation with GS strain rate of turbulent velocity field. In place of the conventional model, a new SGS combustion model has been proposed under assumptions of fractal characteristics of flame fronts and the scale separation of turbulence. The predicted results by the proposed model coincide very well with DNS results.
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Nobuyuki OSHIMA, Shigefumi TOKUDA, Takuji TOMINAGA, Marie OSHIMA
Article type: Article
Session ID: 414
Published: September 18, 2005
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In recent years, it has been necessary to obtain and predict exactly instantaneous temperature, concentration, flame shape, etc. in design of practical combustor. This research develops a simulation method for practical turbulent combustion flows using an unstructured grid system, Large Eddy Simulation (LES) and combustion models based on a flamelet approach. In this report, a combustion model based on a flamelet approach is introduced to the next generation fluid dynamics software "FrontFlow/red" and its accuracy is verified by comparison of the numerical results with ones using detailed chemistry in laminar diffusion combustion.
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Kazui FUKUMOTO, Yoshifumi OGAMI, Yoshinobu YOSHIHARA
Article type: Article
Session ID: 415
Published: September 18, 2005
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This paper describes a simulation method of a combustion furnace with the partial equilibrium method. In this research, turbulent mixture of chemical species with air is considerd first by the eddy dissipation model, and then, species for combustion is estimated by Arrhenius rate. Finally, the products are calculated with the mixed air for combustion by the chemical equilibrium method. The predicted results are in close agreement with the experiment data but benzene and naphthalene can not be calculated. The cause is the boundary condition is different from the experimet and comparison between the calculation and the experiment is needed.
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Ryoichi KURIHARA, Jinnichi KUBOTA, Etsuo KUME, Yasuji KOZAKI
Article type: Article
Session ID: 416
Published: September 18, 2005
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Tokamak type of nuclear fusion power reactors has been conceptually designed in the Japan Atomic Energy Research Institute. The first wall is subjected to high heat flux and high energetic neutrons or particles from the plasma reacting nuclear fusion. Heat flux beyond 10MW/m^2 loads on a divertor plate locally. Therefor, some concepts of liquid wall are proposed as the first wall. A concept of liquid wall in the tokamak reactor was examined in terms of heat removal by simulations using the computational fluid dynamics (CFD) analysis codes. In the concepts, liquid such as the molten-salt Flibe is introduced to remove heat flux from the plasma. The CFD codes, STAR-CD and FLUENT based on the finite volume analysis method were used to model the flowing liquid wall. It was indicated that the STAR-CD and FLUENT tend to result in a lower value than the true heat flux, because the heat flux is applied to the free liquid surface via a gaseous layer.
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Kota FUKUDA, Kyoji KAMEMOTO
Article type: Article
Session ID: 417
Published: September 18, 2005
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An inclined collision of two vortex rings is simulated using the grid-free redistribution model proposed by the authors (2004), in which each vortex particle is redistributed into some elements in accordance with its deformed scale at each time step. In this study, the vortex element elimination scheme is proposed and introduced into the redistribution model. In the scheme, the local energy dissipation rate is calculated and the elements are eliminated considering the dissipation rate. In order to investigate the effect of the scheme, the flow patterns and analyzed energy spectra are compared with existing DNS data and results of experiments. The results show that the energy spectra and energy cascade mechanism are reasonably simulated and by introducing the element elimination scheme, the calculation load can be reduced without affecting the resolution of large-scale structures.
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Jun ETOH, Makoto TSUBOKURA, Shigeaki KURODA, Binghu PIAO
Article type: Article
Session ID: 418
Published: September 18, 2005
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LES and DNS of accelerating plane channel flows were conducted to investigate the validity of LES to such a flow. From the DNS results, it was observed that a rather rapid acceleration process consists of two parts: the former is the increase of the streamwise turbulent intensity, or corresponding elongation of the sublayer streaks, and the latter is the re-distribution of the turbulence to the other two directions. It was found that LES with a simple eddy viscosity model could not reproduce the latter re-distribution process at both coarser and finer grid resolutions tested here, despite the better prediction of the former process regardless of the adopted grid resolution.
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Takeshi AKINAGA, Tomoaki ITANO, Masako SUGIHARA-SEKI
Article type: Article
Session ID: 821
Published: September 18, 2005
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Recent experimental study using cultured endothelial cells indicated that the albumin uptake for endothelial cells with a neutralized (no charge) glycocalyx layer was almost twice that of control cells with negatively charged layer. This experiment together with previous in vivo studies suggests a major effect of electrical charges on the solute permeability across microvessel walls. As a basis to understand this mechanism, we have developed an electrostatic model for the transport of charged solutes through small cylindrical pores with a surface charge, and examined numerically the charge effect on the solute transport when the concentration difference of the solutes is present across the pore. By taking into account the interaction energy between the solute and pore surface charges, we have estimated the diffusive permeability to the solutes, as a function of the surface charges, the ion concentration of the fluid, and the radius ratio of the solutes and the pore. It was found that when the solute and the pore have surface charges of the same sign, the diffusive permeability is reduced significantly even for small Debye length compared to electrically neutral cases.
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Daisuke ETO, Koji MIYAZAKI, Ryusuke TAHARA, Hiroshi TSUKAMOTO
Article type: Article
Session ID: 822
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We investigated the effects of fibrin concentration on thrombus formation by using Monte Carlo simulations. Only coulomb forces were considered as the intermolecular potential of fibrin for simplicity. The motions of 1,000 fibrins were calculated in the simulations. The concentration was increased by decreasing the size of calculation domain. When the concentration was increased, the cluster size was suddenly increased over 0.03 [g/100ml]. In this study the threshold concentration of fibrin was discussed for thrombus formation.
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Kenichi Suzuki, Hideki Fujita, Ami Ogata, Noriko Tamura, Shinya Goto, ...
Article type: Article
Session ID: 823
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We examined how the deformability of the particle influenced on the adhesion of particle to vWf surface, the concentration profile in flow channel and the dispersion coefficient in vitro for developing the artificial platelet substitute. We employed recombinant GlycoproteinIbα conjugated Latex Beads (rGPIbα-LB) and rGPIbα conjugated phospholipid vesicles (rGPIbα-vesicles) as platelet substitute. These particles were observed at high wall shear rate (1500 s^<-1>) with a 40% hematocrit in rectangular flow channel (height and width were 200μm), which had von Willebrand factor (vWf) surface. The rGPIbα-LB adhered to vWf surface firmly, but rGPIbα-vesicle repeated attaching to vWf surface and detaching from vWf surface. The concentration-peak of rGPIbα-LB was near vWf surface more than that of rGPIbα-vesicle. This result shows that rGPIbα-LB existed near vWf wall more than rGPIbα-vesicle. It is considered that this characteristic makes rGPIbα-LB easier to attach to vWf surface than rGPIbα-vesicle. The mobility of rGPIbα-vesicle is bigger than rGPIbα-LB in blood flow, because the dispersion coefficient of rGPIbα-vesicle was bigger than that of rGPIbα-LB. If the particle conjugated only rGPIbα-LB or AMS (rigid particle) is better than vesicle (particle with deformability) from viewpoint of adhesion and concentration profile. But the mobility of rGPIbα-vesicle is bigger than rGPIbα-LB in blood flow. We must consider which carrier we employ based on those characteristics.
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Qiaoqiao SHEN, Ryo SHIRAKASHI
Article type: Article
Session ID: 824
Published: September 18, 2005
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It is reported that the disaccharide trehalose adds desiccation and/or freezing tolerance to proteins by stabilizing their conformation. However, this stabilizing effect sensitively depends on the sort of proteins. In our study, effects of trehalose on the desiccation and/or freezing tolerance of F1 and FOF1-ATPase were investigated. The deactivation of ATPase in consistent with trehalose after drying or freezing was measured to estimate the protein stability. The results showed that trehalose scarcely increased the desiccation tolerance of F1-ATPase. On the other hand, the freezing tolerance of FOF1-ATPase was improved 10〜20% by addition of trehalose.
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Kohji MITSUBAYASHI, Yoshihiko WAKABAYASHI, Toshiaki OKAMOTO
Article type: Article
Session ID: 825
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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An artificial active transportation system was constructed by using two funnel type glass tubes separated by an enzyme diaphragm membrane, in which catalase was immobilized onto the single side of the dialysis membrane. By applying hydrogen peroxide (H2O2) solution into the non-enzyme side of the glass tube, the tube pressure at the enzyme side increased continuously. In consequence, an active transportation of hydrogen peroxide through the asymmetric enzyme membrane could induce the pressure increase in the enzyme side tube (max.: 5000 Pa), thus resulting in the discharge of buffer solution from the enzyme-side tube with non-pulsating flow with good repeatability (4.31% of correlation of variation). The tube pressure at the membrane side indicated the linear relationship with the concentration of hydrogen peroxide from 11.8 to 123.6 (mmol/l).
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Kaori KURIBAYASHI, Shoji TAKEUCHI
Article type: Article
Session ID: 826
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In this paper, we propose a method for preparation of giant liposomes in microfluidic channels with electroformation method. Liposomes formed by electroformation were mostly giant liposomes and did not enclose liposomes inside. Using microfluidic channels with this method, we have succeeded in enclosing different types of the nano/micro beads as a bio-functional material into giant liposomes in the same microfluidic device simultaneously.
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Shigeru TADA, John M. Tarbell
Article type: Article
Session ID: 827
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Atherosclerosis is a disease of the coronary, carotid, and the other proximal arteries in the arterial wall. The disease tends to be localized in regions of curvature and bifurcation in arteries where fluid shear stress and other fluid mechanical characteristics deviate from their normal spatial and temporal distribution patterns in straight vessels. Arterial hypoxia in the arterial wall has for many years been implicated in the development of atherosclerosis and has been suggested the key contributing factor to the formation of atherosclerotic lesions. However, there have been very few investigations of oxygen transport processes those are coupled and strongly influenced by local blood flow patterns. In the present study, details of convective-diffusive oxygen transport were examined numerically using an elastic-wall model of human carotid bifurcation. The field of oxygen tension within the bifurcation was shown to closely follow motion of distensible wall and flow field features. Local variations in oxygen transport patterns were significant and much larger in magnitude than those in wall shear stress. Results show that the complex wall geometry varying with time provides substantial local variations in oxygen transfer rates rather than the complex flow field due to secondary flow induced in cross-sections of the internal carotid.
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Fuguo LI, Naoto KAKUTA, Yukio YAMADA
Article type: Article
Session ID: 828
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We have proposed a method for non-invasively measuring the temperature changes of water in a micro-region using near infrared (NIR) light. The goal of this study is to measure the temperature changes of biological cells or tissues. This method is on the basis of the phenomenon that the NIR absorption spectrum of water depends on temperature. Absorbance spectra in the wavelength range of 1300-2000nm of water with a thickness of 100 and 500μm were measured by a micro-spectrometer. The measured spectra with temperature-dependence were calibrated using a regression analysis. The standard error of calibration was 0.30℃ for 100μm-thickness.
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Masanori KITANO, Yuichi NAKAMURA, Kristjan PILT, Hidenobu ARIMOTO, Nao ...
Article type: Article
Session ID: 829
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Patients of kidney disease remove excess water by hemodialysis. In hemodialysis, blood pressure may fall and the patients may suffer from hypovolemic shock, because body fluid removal rate is normally larger than plasma refilling rate. The aim of our research is to measure water content in issue in order to prevent the hypovolemic shock and to know how much water has to be removed quantitatively. We employ a technique using near infrared spectroscopy for this purpose. It will have advantages of being real-time, noninvasive and continuous.
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Eiji SAKAI, Toshinori WATANABE, Takehiro HIMENO
Article type: Article
Session ID: 830
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Flow patterns and axial gas transport in avian lungs were investigated numerically in oscillatory flow through an avian lung-like bifurcating tube with four T-bifurcations. Flow condition was selected to match avian respiration. Magnitude of unidirectional net flow and gas transport efficiency, which was defined as a volume ratio of fresh gas expired from the outlet of a daughter tube to that inspired from the inlet of a mother tube, were compared with those in single T-bifurcating tube in previous study. The result showed that the magnitude of unidirectional net flow was enhanced about 1.8 times, and the gas transport efficiency was about 1.2 times as large as that in single T-bifurcating tube. At the inlet of the mother tube, smaller pressure amplitude was observed in the present case than in the single T-bifurcating tube case. These findings indicated that multi-bifurcation structure of the avian trachea played an important role in the generation of unidirectional flow and enhancement of axial gas transport.
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Kouichiro HIRANUMA, Takayoshi INOUE
Article type: Article
Session ID: 914
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Short pulsed lasers have been used for laser machining. But sometimes thermal or mechanical damages are recognized on the target materials. In this work, Molecular Dynamics (MD) simulations of light to thermal energy conversion process are conducted to study laser ablation by short pulsed lasers. From the results of MD simulation, the effects of laser profiles on ablation phenomena are investigated. It is confirmed that our MD model of light to thermal energy conversion agrees qualitatively with experimental results.
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Masahiko SHIBAHARA, Tomoaki KUNUGI, Masashi KATSUKI, Kosuke INOUE
Article type: Article
Session ID: 915
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Liquid molecular behavior in the vicinity of a surface was calculated by using the classical molecular dynamics method in order to investigate effects of surface structural clearance in nanometer scale to dynamic behavior of liquid molecules numerically. Surface structural clearances were changed from 1nm to 10nm in the present study. Self diffusion coefficients of fluid molecules between nanoscale structures were dependent on structural clearances in nanometer scale.
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Hideki TAKEUCHI, Kyoji YAMAMOTO, Toru HYAKUTAKE
Article type: Article
Session ID: 916
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The gas-wall interaction is investigated for the flow between two walls. The method of analysis is based on the molecular dynamics method together with DSMC method. The gas is taken to be N_2 and the wall consists of Pt molecules. Two cases of wall surface are considered: smooth surface and the surface with adsorbates. The momentum and energy accommodation coefficients are obtained. The Maxwell-type boundary condition is found to well describe the distribution function of the reflected molecules.
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Keisuke UEOKA, Kazuhiro ITOH, Hiroshige KUMAMARU, Yutaka KUKITA
Article type: Article
Session ID: 917
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We performed a molecular dynamics simulation of the boiling nucleation process of liquid argon faced on heated solid surface. The solid wall at the bottom of calculational domain consisted of platinum molecules based on a harmonic potential and the interaction between argon and platinum particles was calculated by Lennard-Jones potential function. The periodic-shell boundary condition was employed at the upper boundary of domain as a simulant of liquid argon pool. The simulation started from equilibrium condition at 100 K. The temperature of argon increased with increase in that of wall molecules. It was confirmed that the boiling occurred and the vapor bubble developed near heated solid wall with an increase in heated time.
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Masaru USAMI
Article type: Article
Session ID: 918
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The new intermolecular collision scheme is investigated on the time interval of update of flow variables used for modification of molecular velocities. The method of approximation of a curve with straight lines is studied for the DSMC calculation so that the automatic programming system 'DSMCplus' is improved to handle any shape of boundaries.
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Kouichi Utsunomiya, Yukinori Sakiyama, Shu Takagi, Yoichiro Matsumoto
Article type: Article
Session ID: 919
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We proposed a new rotational relaxation model for polyatomic molecules in nonequilibrium rarefied gas flow, which is based on dynamic molecular collision (DMC) model for diatomic molecules. The classical trajectory calculation (CTC) was conducted to simulate a large number of binary collisions in various conditions. Here, the pair potential model derived from the ab initio calculations was used for the intermolecular potential energy, while the molecules are regarded as rigid rotors. From the statistical analysis of the CTC, we found the probability density function of the translational/rotational energy transfer was expressed by the single exponential law as well as the DMC model. And we applied this model to the DSMC calculation and demonstrated the temperature relaxation.
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Hideto TAKEKIDA, Kenichi NANBU
Article type: Article
Session ID: 920
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The structures of axisymmetrical inductively-coupled CF_4 plasmas and radicals flow were examined by using the Particle-in-Cell/Monte Carlo method and direct simulation Monte Carlo method. Here are clarified the effects of pressure, power deposition, and wafer biasing on the plasma structure.
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Hiroaki MATSUMOTO, Michiro OGAWA
Article type: Article
Session ID: 921
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The validity of variable sphere molecular model for the Monte Carlo simulation of rarefied gas flow is examined by the simulation of thermal creep flow in a two-dimensional cavity. Macroscopic profiles in the cavity, such as density, velocity, and temperature profiles are quite in good agreement with those results of inverse power law potential.
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Hideo MORI, Tomohide NIIMI, Madoka HIRAKO, Hiroyuki UENISHI, Yu MATSUD ...
Article type: Article
Session ID: 922
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The pressure sensitive paint (PSP) technique has the capability to be applied to high Knudsen number flows, such as low density gas flows, micro-flows, and so on. However, applications of the PSP technique to micro/nanodevices have never been reported, because of the thickness of the conventional PSPs and of the low resolution caused by the aggregation of luminescent molecules. In this study, we have constructed ultrathin PSP films for micro/nanodevices by the Langmuir-Blodgett (LB) technique. Two luminophores are examined to select the suitable one for LB-PSP. Moreover, the dependence of luminescence intensity and oxygen sensitivity of the LB-PSP on the number of the layer is clarified.
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Ikuya KINEFUCHI, Akira ITO, Hiroki YAMAGUCHI, Yukinori SAKIYAMA, Yoich ...
Article type: Article
Session ID: 923
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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A molecular beam apparatus has been constructed to investigate the oxidation dynamics of Si(100) surface with O_3, which is a promising oxidizing species to reduce the thermal budget during SiO_2 film formation for gate oxide in semiconductor devices. With the surface exposed to the modulated molecular beam, time-resolved measurements of product molecules desorbing from the surface give us a clear understanding of the reaction dynamics. As the first step of our study, the active oxidation of Si(100) surface with O_2 was investigated employing molecular beam relaxation spectrometry to check the performance of the apparatus. The Fourier analysis of product waveforms indicated that the reaction can be described by the sequential two-step first-order reaction process. The activation energy of each step agreed with the values in literatures.
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Satoru MIKAMI, Tatsuki OTA, Kazumichi KOBAYASHI, Sigeo FUJIKAWA, Taker ...
Article type: Article
Session ID: 924
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The condensation coefficient is obtained by combining a shock tube experiment and the corresponding numerical analysis based on the Gaussian-BGK Boltzmann equation. In the experiment, the liquid film growth on the shock tube endwall behind the reflected shock wave is measured with a high accuracy by an optical interferometer. The interferometer system is improved, which enables us to combine the experiment and numerical analysis more closely. The results show that the condensation coefficient of methanol takes values from 0.7 to 0.9 in nonequilibrium states, and the values are close to that of evaporation coefficient evaluated by molecular dynamics simulations.
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Kazumichi KOBAYASHI, Satoru MIKAMI, Tatsuki OTA, Takeru YANO, Shigeo F ...
Article type: Article
Session ID: 925
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We perform the determination of the condensation coefficient for methanol by combining a numerical analysis based on the molecular gas dynamics and shock tube experiment. In the numerical analysis, the boundary condition for the Boltzmann equation at the vapor liquid interface is rewritten using the net mass flux obtained from the shock tube experiment. Thereby, the condensation coefficient is determined by the vapor-liquid system. The result shows that the value of the condensation coefficient for methanol ranges from 0.7 to 0.9, and it is close to that of the evaporation coefficient evaluated by the recent molecular dynamics simulation.
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Yoshihiko NOMURA, Ryutaro MATSUDA, Ryota Sakamoto, Tokuhiro SUGIURA, H ...
Article type: Article
Session ID: 2301
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Information processing and communication technology are progressing quickly, and are prevailing throughout various technological fields. Therefore, the development of such technology should respond to the needs for improvement of quality in the e-learning education system. The authors propose a new video-image compression processing system that ingeniously employs the feature of the lecturing scene: recognizing the lecturer and the fescue by pattern recognition techniques, the video-image compression processing system deletes the figure of a lecturer of low importance and displays only the end point of a fescue. It enables us to create the highly compressed lecture video files, which are suitable for the Internet distribution. We compare this technique with the other simple methods such as the lower frame-rate video files, and the ordinary MPEG files. The experimental result shows that the proposed compression processing system is much more effective than the others.
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