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Sevilay CAN, Makoto UCHIDA, Shigeru NISHIO
2003 年 23 巻 Supplement2 号 p.
165-168
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
The Turkish strait is one of the most important routes of oil transportation. It connects the Black Sea and the Mediterranean, and it enables us to transport the oil produced in the north of Black Sea to Europe directly. The oil spill problem originated from tanker accidents is one of the major topics concerning about the safety ship operation in Turkish straits. There have been large accidents occurred beside a mega city Istanbul, which has thirteen million population. The tanker accident in Turkish strait could be a huge disaster that directly attacks on the life in city. Present paper describes the numerical simulation of oil spill in Turkish strait that enables us to estimate the effect of oil spill when tanker accident occurs.
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林田 均, 松本 聡, 小宮 敦樹, 夏井 秀定, 依田 真一
2003 年 23 巻 Supplement2 号 p.
169-170
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
In the fluid observation experiments using a molten metal which is an opaque low Prandtl number fluid, the internal flow pattern has to be estimated from the fluctuation pattern of the surface temperature. In order to obtain the internal flow pattern directly, the visualization technique using an ultrasonic wave has been developed. It is composed of the small array sensor for high temperature, the tracer particles and signal processing unit. The position of a tracer can be detected by small array transducer, and the internal flow pattern can be visualized from dynamic position change of the tracers. The possibility of this visualization technique has been made clear by estimating the signal to noise ratio using imitative experiment.
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小山 忠勇, 津田 尚一, 平林 則明, 口石 茂, 穂積 弘一, 関根 英夫
2003 年 23 巻 Supplement2 号 p.
171-174
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
Quantitative measurement method of heat transfer distribution has been studied using infrared camera system in the NAL 1.27m hypersonic wind tunnel. The error factors of this method can be classified as: 1) quality of the flow, 2) thermal model, 3) model material, and 4) optical measurement performance of infrared camera. The uncertainty levels of these error factors were evaluated respectively. Experimental results by this method are compared with those of co-axial gauge method using a hemisphere model, a flat_plate ramp model and HB-2 model. The total measurement error of ±5% is assessed.
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KOH揮発量の測定
古賀 拓馬, 山内 慎, 杉浦 公彦, 谷本 一美, 葭谷 安正
2003 年 23 巻 Supplement2 号 p.
175-178
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
DIR-MCFC have problem that the reforming catalysts are polluted by the volatile species of molten carbonate. However, main species of volatized molten carbonate and its physical properties have not been clarified. In this research, volatile species of molten carbonate is assumed to be Hydroxide such as KOH, LiOH and NaOH etc. because molten salts easily react with water (the supplied water and produced water). As Hydroxide is a gas-phase in the operating temperature region, cannot be measured by using image measurement technique. Because Hydroxide becomes a carbonate (solid-phase) if it reacts with CO2, Hydroxide can be measured by measuring the carbonate. And the amount of Hydroxide volatilization is calculated by concentration presumption from the intensity information by image measurement. As a result, KOH concentration was measured by reacting with CO2. It was quantitatively clarified that the temperature of KOH melt is in proportion to KOH concentration.
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Shinkichi ABE, Koji OKAMOTO, Haruki MADARAME
2003 年 23 巻 Supplement2 号 p.
179-182
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
This paper reports a new technique for measuring oxygen density distribution in space. The PSP (Pressure Sensitive Paint) are usually used for noncontact measuring pressure distribution on a surface. The pressure measurement is based on the phenomena of luminescence quenching by oxygen molecules. In order to measure the oxygen density distribution in space, instead of a surface pressure distribution, the PSParticle (Pressure Sensitive Particle) for seeding gas was developed. Due to the particles are always moving in space, the Double Frame Imaging (DFI) be developed. This new method can give the relationship between oxygen concentration and image intensity. The method that uses PSParticle can be obtained the velocity information as the PIV technique at same time. Therefore, this new technique has a possibility to compose the PIV-PSP hybrid system.
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吉田 友紀子, 内海 康雄, 三田村 輝章
2003 年 23 巻 Supplement2 号 p.
183-184
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
It the visualization information research field, at present, the visualization of a survey result itself became the purpose and the argument was made only for visualization technology in many cases. However, it is thought that visualization information is developed as one of the important technology, and continues to spread as a tool whose argument exceeds its field and is promising. Moreover, if a complicated scientific result also uses the Internet with development of an information technology and the output of visualization information of interest, anyone can find information, easily. By this report, a theme considering the synthesis of visualization information and integration as output was tried by EIS(Environment Information System).The information dealt is from a building detailed apparatus to a city scale. An interactive calculation result is planned to be on web as output in future.
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清水 保, 長谷部 正彦, 鈴木 善晴, 日野 幹雄
2003 年 23 巻 Supplement2 号 p.
185-188
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
In recent years, global warming is aggravating and CO2 concentration in the atmosphere is generally a major cause. Consequently, it is necessary to grasp the variation characteristics of CO2 concentration and to raise the concern about environment by visualizing CO2 concentration in the atmosphere.
Then, the report enabled expression of three dimensions by CO2 concentration in the atmosphere, time domain and frequency domain by using the continuous wavelet analysis made a base function; the Maxican-hat type. Therefore it clarified the local periodic characteristics. Moreover, the space distribution characteristics was clarified by using the contour of CO2 concentration in the whole earth.
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小川 真也, 平原 裕行, 川橋 正昭
2003 年 23 巻 Supplement2 号 p.
189-192
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
Traffic, pedestrian and creature's flows etc. are seemed to be a crowd of intellectual particles. The crowd sometimes has been analyzed phenomenologically, statistically or kinematically. The features of the behavior of crowd depend on the many factors as personality, individual velocity, peculiar velocity, intelligence and educated level of the crowd, etc. In the present paper, a crowd of pedestrian was analyzed by using a direct simulation of molecular dynamics method. The interaction between the pedestrians was presented by Morse potential, which was selected by preliminary simulation. A quasi one-dimensional pedestrian flow was simulated to discuss the relation between the individual walking speed and the local density and the propagating information of the state of crowd. Consequently, the physics of the crowd motion was discussed in detail from the viewpoint of thermo-fluid dynamics.
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富村 寿夫, 本田 洋仁, 濱野 光司, 越後 亮三
2003 年 23 巻 Supplement2 号 p.
193-196
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
To investigate the relation between heat transfer characteristics and working gas flow of the gas-to-gas heat exchanger equipped with porous metal plates, heat transfer experiments by three-layered type of heat exchanger and visualization of flow field using a transparent heat exchanger unit and a smoke machine have been conducted. In the present study, the effects of the presence of porous metal plates and the fin configuration of the walls (that is, bare, straight, or zigzag) have been examined extensively. From the experiments it has been shown that flow fields with and without porous metal plates totally differ from each other, and the corresponding total heat recovery rates have been discussed in conjunction with the visualized flow field. Further, zigzag fin walls are shown quite effective to obtain uniform flow field in the present heat exchanger.
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奈良崎 道治, 大木 英二, 小河 原稔, 白寄 篤, 淵沢 定克
2003 年 23 巻 Supplement2 号 p.
197-200
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
For optimization of heat-treating process of steel parts, the improvement of the analytical accuracy in heat-treatment simulation is required. The influence of the surface heat transfer coefficients on the quench simulation accuracy was studied. It was clarified that the simulated microstructure, residual stress and distortion are very sensitive to the surface heat transfer coefficients. Therefore, we need to employ the accurate heat transfer coefficients on each surfaces of quenched steel parts.
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浦井 勇, 山梨 鎮, 二宮 尚
2003 年 23 巻 Supplement2 号 p.
201-202
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
Recently, the demand for the compactness of the hot-water heater is getting greater and greater. In order to achieve the same performance with smaller hot-water heater, the development of the small heat exchanger with high-efficiency is the most important issue. According to the preliminary investigation about the flow inside a hot-water heater, the non-uniformity of the flow around the heat exchanger seems to prevent the high efficiency. Presently, the flow inside a hot-water heater is visualized by the particle tracer method by filling the off-the-shelf hot-water heater with water. The results show that the shape of the chamber, which is located downstream of the heatt exchanger, affects the flow upstream. Thus the installation of the blocking plate is found to kill the non-uniformity of the flow and will contribute to increase the heat transfer efficiency without changing the whole shape of hot-water heater.
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青木 拓也, 池田 裕一
2003 年 23 巻 Supplement2 号 p.
203-206
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
The river landform or the riverbed form is very complicated and a change like 3-D is often shown. Moreover, recently, to grasp the replying of the riverbed form to the flow of the river that changes in the time is looked for. Therefore, in this research, it tried the construction of the system that measures a riverbed form in case of indoors experiment from the stereophotograph. Concretely, it the photograph took the situation of the riverbed (the pattern of sand) first with the stereo using the digital camera. It fixed compatible of the identical point during image by the correlation analysis of two images. It applied the technique of the analysis photogrammetry to the result and it calculated 3-D coordinates on the riverbed. Then, it changed a photography condition and it compared between the calculation result and the actual measurement result by the system.
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加藤 貞二, Md. Nazrul ISLAM
2003 年 23 巻 Supplement2 号 p.
207-208
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
We report here about the visualization of structures of Langmuir monolayers and Gibbs monolayers at water surface using Brewster angle microscopy (BAM), and also visualization of structures of mixed Langmuir monolayers by using friction force microscopy (FFM) after transferring onto smooth solid surface. Structures of condensed phase domains, relaxations in monolayers, very curious shape condensed domain formation, and sub-micrometer size phase separation in mixed monolayers are explained
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尾崎 功一, 菊池 浩二, 山本 純雄
2003 年 23 巻 Supplement2 号 p.
209-210
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
In the study of pollen for plant cross breeding, it is considered that the shape of pollen and the genetic characteristic of its plant are related. In order to evaluation this relationship, it is necessary to observe pollen. This report describes the shape and the pattern quantities based on observing the pollen by image measurement, and shows visualization of the genetic characteristics of its pollen. In experimental results, it is shown that genetic characteristics of two types of pollen grains of cultivated species and their hybrid ones are visualized by these quantities by image measurement.
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檀 和秀
2003 年 23 巻 Supplement2 号 p.
211-214
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
When the natural light waves travel into the interface between water and air a part of the light waves refracts and diffracts at the interface. When these waves travel to the horizontal observation plane located at the bottom of the water these waves make the light intensity profile in this observation plane. It is possible to calculate the wave profile by applying Suzuki-Sumino's method to the light intensity profile observed at the bottom in shallow water.
The projected wave surface images on the bottom of the water and the wave surface images obtained with a camera in the sea are shown.
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辻野 真也, 武居 昌宏, 越智 光昭
2003 年 23 巻 Supplement2 号 p.
215-216
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
Void fraction of solid-gas two phase flow in a horizontal pipe has been measured using capacitance CT. It was confirmed that the relation between the void fraction and flow pattern from the experiments that made flow velocity and particle height of an initial accumulation bed the parameter. As a result, the flow pattern was classified three kinds.
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小針 直, 伊藤 聡志, 山田 芳文
2003 年 23 巻 Supplement2 号 p.
217-218
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
When two methods of solving the Fresnel transform signal are combined and used, a band splitted image is obtained under a certain condition.An image having improved SIN is obtained by applying a noise elimination filter in this band splitted image space and by reconstructing image from the denoised Fresnel transform signal. The method which uses the "method 1" for forming the Fresnel transform signal from the MR image and uses the "method 2" for obtaining the band splitted image is called the Modified FREBAS method. In the Modified FREBAS method, if the surroundings of the formed Fresnel transform signal by the method 1 is filled with zero and applied the method 2 for obtaining the band splitted image, some noise diffuse to the area where zeros are supplemented. The SIN improved image is obtained by the zerofilling Modified FREBAS method by removing the noise with using the Wiener filter in the band splitted image space and by reconstructing after returning to the Fresnel signal space through tracing the reverse-process.
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音堅 成仁, 伊藤 聡志, 山田 芳文
2003 年 23 巻 Supplement2 号 p.
219-220
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
Denoising of images by the Wavelet conversion is widely researched. The image reconstruction in the Fresnel transform technique is done through several signal stages, and each stage in the process has quite different signal pattern. Therefore, executing the noise removal processing, denoising, using the Wavelet conversion in each stage becomes possible. We obtained the most excellent denoising result when we applied the Wavelet-denoising in the reconstructed image stage. Moreover, if the Wavelet-denoising using the same Mother-Wavelet was done in two signal stages of the image reconstruction process in the Fresnel transform technique, it was confirmed to be able to improve the image S/N more greatly compared with the case when the Wavelet-denoising was done only in a single stage.
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菊地 貴行, 佐藤 美恵, 春日 正男, 横森 欣司
2003 年 23 巻 Supplement2 号 p.
221-222
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
The testis usually descends to the scrotum through the groin, and normally reaches into the scrotum before birth. Cryptorchidism is a condition in which either one or both testes does not fully descended into the scrotum before birth. Instead, the testis gets stuck in the groin or even in the abdomen. Cryptorchidism is most common in premature babies, and mostly only one testis is affected. Before the surgery to bring an undescended testis down in the scrotum, the pediatric surgeon conducts CT inspection and checks the position and size of the undescended testis. Because there are only 443 qualified pediatric surgeons in Japan, it is worth helping them in the interpretation of many CT images in diagnosis of cryptorchidism.
We propose a method of extracting regions from the CT images where an undescended testis may exist, based on the information of the other normal testis, and experiment with CT images of patients with an undescended testis.
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林 稚人, 小幡 輝夫
2003 年 23 巻 Supplement2 号 p.
223-226
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
This paper describes experimental result of drag characteristics of the object with the slit. The test pieces are the column that the slit of straight, Y-type slit and clearance tapes were installed for the spiral rolls at 45. Slit width, Y-type opening angles, pitch of the spiral roll were changed. The Reynolds number is 60000. Using the smoke wind-tunnel facility, the flow visualization experiment processes image by the digital camera by the computer after the photographing.
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由利 真一, 小幡 輝夫, 倉澤 英夫
2003 年 23 巻 Supplement2 号 p.
227-230
発行日: 2003/10/15
公開日: 2009/12/08
ジャーナル
フリー
When a fine screen is placed normal to vertically the axis of the jet, examined of the concerned with the self-sustained oscillation in a shear layer. Screens with several mesh sizes are employed. The screen is moved in the direction of the jet axis. The shear layer starts to oscillate periodically and simultaneously the characteristic of the self-sustained oscillation is examined from sound radiation in the screen vicinity. Flow visualization data suggest qualitatively the shear layer-screen interaction pattern and associated after passing through the screen.
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羽田 貴紀, 伊藤 光
2003 年 23 巻 Supplement2 号 p.
231-234
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
The spiral vortex flows around a rotating sphere with smooth surface in still air were visualized by means of smoke-injection and smoke-wire method. The experiment was conducted at the rotating speed of the sphere with a diameter of 100mm at the range of 2280rpm. It was found that the air-jet flows spread from the equator of the sphere and the spiral vortex accompany with it. As the increasing rotating speed, the breakdown position of the vortex flows approached the sphere surface. Furthermore, the distributions of the tangential and radial components of the flow velocity and turbulent intensity around the rotating sphere were measured using a hot-wire anemometer with an x-probe. The measured results were compared with the visualized smoke patterns, and were also discussed the breakdown process of the vortex flows.
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宮地 英生
2003 年 23 巻 Supplement2 号 p.
235-238
発行日: 2003/10/15
公開日: 2009/07/31
ジャーナル
フリー
"VizJournal" is a Internet magazine which is managed by KGT. It includes usuful information for visualization scientists and computer visualization software users.
"Topics" includes conference report like SIGGRAPH and leading researchs.
"User report" shows the example how to use visualization software and "New products" introduces both hardware and software for visualization. Specially, KGT new products may be introduced at this page earlier than the official release. Anybody can access this page with no charge. Please visit to http://www.viz-journal.kgt.co.jp.
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