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  2. 武居 昌宏

武居 昌宏

タケイ マサヒロ  (Masahiro Takei)

基本情報

所属
千葉大学 大学院工学研究院総合工学講座 教授
学位
博士(工学)(1995年3月 早稲田大学)
ORCID ID
 https://orcid.org/0000-0003-3855-7202
J-GLOBAL ID
200901064060287550
researchmap会員ID
1000182863
外部リンク

研究キーワード

 7

研究分野

 1

経歴

 6
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学歴

 2

委員歴

 19
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受賞

 18
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論文

 358
  • Motoaki Kimura, Masahiro Takei, Yoshifuru Saito, Chih-Ming Ho, Kiyoshi Horii
    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 253 439-445 2000年  
    Two dimensional stripe structure in turbulent boundary layer has been clearly visualized by a combination of a shear stress sensor using MEMS (Micro-Electro-Mechanical-Systems) and discrete wavelets transform. The MEMS shear stress micro chip is designed and fabricated by surface micro-machining technology, contributing to obtaining the time-space two dimensional shear stress data. The discrete wavelets transform is a software technique to decompose the frequency level with the time and space information of the wave form. The experiments for the shear stress distribution were carried out on Re = 6960, 12180 and 17400. This technique for a single phase flow is applicable to multiphase flow analysis.
  • Motoaki Kimura, Masahiro Takei, Norimasa Miyagi, Yoshifuru Saito, Chih-Ming Ho, Kiyoshi Horii
    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 253 431-438 2000年  
    Shear stress stripe structure on the wall in turbulent boundary layer has been clearly visualized and found out by a combination of a shear stress sensor using MEMS (Micro-Electro-Mechanical-Systems) and discrete wavelets transform. The MEMS shear stress micro chip is designed and fabricated by surface micro-machining technology, contributing to obtaining the time-space two dimensional shear stress data. The discrete wavelets transform is a software technique to decompose the frequency level with the time and space information of the wave form. In details, the structure in lower Reynolds number is shown clearly on lower frequency wavelets level, the structure in high Reynolds number is done clearly on higher frequency wavelets level. To improve the detection result of the high shear stress area, the frequency levels are recomposed using the multiresolution filtering effect of wavelets transform. The experiments for the shear stress distribution were carried out on Re = 8700 and 17400.
  • Masahiro Takei, Mitsuaki Ochi, Kiyoshi Horii, Hui Li, Yoshifuru Saito
    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 253 255-261 2000年  
    Time-frequency distributions of axial turbulence velocities of spiral pipe flow and turbulent flow have been clearly decomposed in a range from low frequency level to high frequency level by means of discrete wavelets transform. The autocorrelation is carried out on the base of the decomposed waveform, in the spiral flow, the time periodicity occurring at lower frequency level near the wall tends to transit to the higher frequency level as the position gets close to the center pipeline moreover, the turbulence level is lower than the turbulent flow. The physical meaning is the spiral flow has an orderly radial velocity to the regularity and has less shear stress gradient in the turbulence layer resulting in the lower turbulence level near the wall. The originality of this paper lies in applying discrete wavelets transform and its autocorrelation analysis to analyzing the spiral flow stable motion in time-frequency dimension.
  • 武居 昌宏, 李 輝, 斎藤 兆古, 越智 光昭, 堀井 清之, DYAKOWSKY Tomasz
    可視化情報学会誌 20(2) 185-186 2000年  
    Particle distribution in a pipeline has been clearly visualized by capacitance-computed tomography at 10 milli-second intervals. The image is transformed with discrete wavelets multiresolution. The particle distribution just after the plugging point gets partial clearly on the wavelets level 0. This technique contributes to predicting pipeline emergency such as plugging. In the experiments, clay is attached the inside of the pipeline in order to simulate near plugging. The CT obtains the capacitance between 12 electrodes distributed around the outside of the pipeline. The particle and air distributions can be separated because of individual permittivity by the reconstruction technique. The technique calculates the permittivity distribution on the cross section from the capacitance values by an iterative method of inverse problem.
  • 加藤 浩一, 武居 昌宏, 越智 光昭, 李 輝, 斎藤 兆古, 堀井 清之
    可視化情報学会誌 20(1) 399-400 2000年  
    Time-frequency distribution of axial velocity of spiral flow has been clearly obtained by discrete wavelet transform and multiresolution analysis. As a result, both of the low frequency level and high frequency level of the spiral flow are lower than those of the typical turbulence flow. It means that the turbulence level of the spiral flow is dramatically lower than the typical turbulence flow. Moreover, the dominant frequency level to lower the turbulence level of spiral flow is clarified. The originality of this paper lies in applying discrete wavelet transform and its multiresolution analysis to analyzing the spiral flow.
  • 武居 昌宏, 木村元昭, 武居昌宏, 宮城徳誠, Chih-MingHO, 斎藤兆古, 堀井清之
    電気学会論文誌E 120(6) 272-279 2000年  
  • 関根 太郎, 武居 昌宏, 岡野 道治, 長江 啓泰, 斎藤 兆古, 堀井 清之
    可視化情報学会誌 20(79) 356-364 2000年  
    Discrete wavelet transform has been applied to analyzing a driver's R-R Interval ta-chogram. Consequently, two specific wavelet levels indicate the dominant frequency that shows driver's mental stress with the time process. This visualization technique is able to replace the former analysis based on Fourier transform in driver's time-transient circum-stances. The experiments are carried out with a driver carrying an electrocardiograph in a passenger car circulating a test course with 140km/h. The R-R Interval tachogram was obtained from the driver before and while driving. The motivation behind this work is to establish a driver's mental model while a driver operates a vehicle. The model con-tributes to safety and comfortable driver's circumstances in road traffics.
  • H Li, M Takei, M Ochi, Y Saito, K Horii
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 42(137) 120-127 1999年11月  
    This paper develops an application of tno-dimensional orthogonal wavelets to turbulence for the identification of multiresolution turbulent structures and coherent structures. The digital imagine slice photographs of a turbulent jet in a far field with Re congruent to 4.5 x 10(3) and 9.0 x 10(3) are respectively decomposed into six image components with different broader scales by wavelet multiresolution analysis. These image components provide visualized information on the multi-scale structures in a turbulent jet. It was found that the edges of the vortices at different resolutions or scales and the coherent structure might be easily extracted. In this problem, three types of image structure. namely the targe-scale structure near the center of;he jet. coherent structure in the shear layer, and the small-scale vortices throughout the entire flow held, which dominate the turbulent structure, were easily extracted. By increasing the Reynolds number, the large-scale structure becomes weaker, and the scales of active vortices and coherent structure decrease.
  • 李 輝, Zhou Yu, 武居 昌宏, OCHI Mitsuaki, SAITO Yoshifuru, HORII Kiyoshi
    可視化情報学会誌. Suppl. = Journal of the Visualization Society of Japan 19(1) 19-22 1999年7月1日  
    We first reviewed the new progress of wavelet analysis in experimental fluid mechanics. As multiscale identification techniques, we then presented two new applications of wavelets in experimental fluid mechanics. Finally, we state several perspectives and point out where new methods need to be developed in order to improve our understanding of turbulent structure.
  • 土方 肇, 武居 昌宏, 李 輝, 越智 光昭, 上田 寛, 斉藤 兆古, 堀井 清之
    可視化情報学会誌. Suppl. = Journal of the Visualization Society of Japan 19(1) 103-104 1999年7月1日  
    Difference between two particle surfaces has been clearly obtained with Fourier-wavelet transform method even though the two particles are located in two dimensional different place. The method consists of three steps, the first is to acquire the difference between two particle surface image data in Fourier space. The second is to operate wavelet transform to the difference image data transformed with inverse Fourier. Finally, the decomposed data with each space-frequency level are acquired by inverse wavelet transform and its multiresolution analysis. The high frequency image shows location and size of the difference. This technique contributes to automation of particles classification.
  • H. Li, Y. Saito, M. Takei, M. Ochi, K. Horii
    Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM) 1 1999年  
    To evaluate eddy structures of a plane turbulent jet in the dimension of time and scale, the velocity signals were analyzed using the continuous and discrete wavelet transforms in this paper. From the distribution of coefficients of continuous wavelet transform, localized nearly periodic eddy motions with a=64ms, 100ms and 180ms were respectively observed in the shear layer of x/d=8.5 in the time range of t=0~220ms, 280~600ms and 680~1000ms, although the local scale of motion always changes with time in unsteady turbulent jet. From multiresolution analysis or discrete wavelet transform, the peak that appears in the component of fluctuating velocity represents the passing of eddy through the shear layer and concentration of the energy of the flow at instant. The intermittent eddy phenomenon or zero components of fluctuating velocity can be observed at higher levels or smaller scales.
  • H. Li, Y. Saito, M. Takei, M. Ochi, K. Horii
    Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM) 1 1999年  
    In this paper the wavelet-based image compression technique is applied to PIV processing for reducing the physical storage. To determine the effect of the choice of the wavelet bases, the standard PIV images are compressed by some known wavelet families, Daubechies, Coifman and baylkin families. It was found that high order wavelet bases provides good compression performance for compressing PIV Images, because they have good frequency localization that in turn increases the energy compaction. The reconstructed PIV image with lower compression ratio may emphasize particle edges at a relatively high spatial resolution, and the reconstructed PIV image with higher compression ratio may display the large-scale motion of particles and may deduce noisy. In this study, higher compression ratio, from 25% to 1.56%, can be realized without losing significant flow information in PIV processing. It can say that the wavelet image compression technique is effective in PIV system.
  • M. Takei, H. Li, H. Ueda, M. Ochi, Y. H. Zhao, K. Horii
    Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM) 1 1999年  
    A transportation system controlling particle movement using spiral flow has been developed. The system transports particles by swirling without touching pipe inner wall. With the system, a styrofoam ball movement in a 10.0 m long horizontal pipeline is observed to discuss controlling the swirling pitch. The system with 90 degrees blow angle transports the particle with a short swirling pitch with a 30 degrees blow angle, there is a long swirling pitch. The device to produce spiral flow is a nozzle with an annular slit attached to a conical cylinder. Due to the Coanda effect in the nozzle, the flow downstream develops a spiral structure with a steep axial velocity distribution and a free vortex region. The blow angle between the annular jet and the nozzle axis determines the azimuthal velocity. Finally, the calculated rotation point and ball trajectory agree reasonably with the experimental results.
  • M. Takei, H. Li, Y. H. Zhao, M. Ochi, Y. Saito, K. Horii
    Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM) 1 1999年  
    Time-frequency distributions of axial turbulence velocities of spiral pipe flow and typical turbulence flow have been clearly decomposed in a range from low frequency level to high frequency level by means of discrete wavelets transform. As a result, the lower frequency levels (under Level 4) of the spiral flow are extremely lower as compared with those of the typical turbulence flow. Moreover, the spiral flow is dominated by Level 3 to be stabilized from the autocorrelation. The originality of this paper lies in applying discrete wavelets transform and its autocorrelation analysis to analyzing the spiral flow stable motion in time-frequency dimension.
  • Hui Li, Yan Lu, Voshifuru Saito, Masahiro Takei, Mitsuaki Ochi, Kiyoshi Horii
    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 250 33-38 1999年  
    The wavelet compression technique was applied to turbulent image processing for reducing physical storage and extracting the compact dominant features in this study. The two compression methods, called zone and threshold compression, were employed. It was found that a high order wavelet basis provided good compression performance for compressing turbulent images and two compression methods exhibited almost same performance. It was realized that the compressed image had both lower compress ratio and larger correlation coefficients. By changing compression ratio the compressed images exhibited different scale structures in turbulent jet. This indicated clear that large-scale structure dominates the jet.
  • Hui Li, Yoshifuru Saito, Masahiro Takei, Mitsuaki Ochi, Kiyoshi Horii
    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 250 27-32 1999年  
    To evaluate coherent structures in the dimension of time and scale, a new procedure based on the multiresolution analysis and multiresolution auto-correlation analysis is developed in this paper. By analyzing u- and v-components of fluctuating velocity, the coherent structure and its scales can be identified when larger amplitude fluctuation and stronger auto-correlation are appeared at same wavelet level. For a turbulent jet at position of x/d=6, the larger coherent structures with frequency 39Hz can be deduced around times 0.29, 0.53, 0.6 and 0.67s. This also represent the passing of eddies through the shear layer and concentration of the energy of the flow at these instants.
  • 木村 元昭, 武居 昌宏, 李 輝, HO Chih-Ming, TUNG Steve, 越智 光昭, 斉藤 兆古, 堀井 清之
    可視化情報学会誌 19(1) 33-36 1999年  
    Stripe structure in turbulent boundary layer has been clearly visualized by discrete wavelet transform based on the shear stress data using MEMS(Micro-Electro-Mechanical-Systems). The chip is designed and fabricated by surface micromachining technology. The characteristics of high shear stress streaks were described with statistics. Physical quantities associated with the high shear stress streaks such as their length, width and peak shear stress level, were obtained.
  • 関根 太郎, 武居 昌宏, 岡野 道治, 長江 啓泰, 越智 光昭, 斉藤 兆古, 堀井 清之
    可視化情報学会誌 19(1) 215-218 1999年  
    Discrete wavelets have been applied to analyzing a R-R Interval tachogram. Consequently, a specific wavelet level indicates the dominant frequency that indicates driver's mental stress with the time process. This method is able to replace former Fourier base analysis in the driver's circumstances. The experiments are carried out with a driver carrying an electrocardiograph in a passenger car circulating a test course with 140km/h. The R-R Interval tachogram was obtained from the driver before and while driving. The motivation behind this work is to establish a driver's mental model while the driver operates a vehicle. The model contributes to safe and comfortable driver's circumstances.
  • Li Hui, Takei Masahiro, Ochi Mitsuaki, Saito Yoshifuru, Horii Kiyoshi
    可視化情報学会誌 19(1) 23-26 1999年  
    In this paper the wavelet-based image compression technique is applied to PIV processing for reducing noise in images and reducing the physical storage. To determine the effect of the choice of the wavelet bases, the standard PIV images are compressed by some known wavelet families, Daubechies, Coifman, and baylkin families. It was found that high order wavelet bases provides good compression performance for compressing PIV Images, because they have good frequency localization that in turn increases the energy compaction. The reconstructed PIV image with lower compression ratio may emphasize particle edges at a relatively high spatial resolution, and the reconstructed PIV image with higher compression ratio may display the large-scale motion of particles and may deduce noisy. In this study, higher compression ratio, from 25% to 6.25%, can be realized without losing significant flow information in PIV processing. It can say that the wavelet image compression technique is effective in PIV system.
  • Li Hui, Takei Masahiro, Ochi Mitsuaki, Saito Yoshifuru, Horii Kiyoshi
    可視化情報学会誌 19(1) 27-30 1999年  
    To evaluate coherent structures in the dimension of time and scale, a new procedure based on the multiresolution analysis and multiresolution auto-correlation analysis is developed in this paper. By analyzing u-and v-components of fluctuating velocity, the coherent structure and its scales can be identified when larger amplitude fluctuation and stronger auto-correlation are appeared at same wavelet level. For a turbulent jet at position of x/d=6, the larger coherent structures with frequency 39Hz can be deduced around times 0.29, 0.53, 0.6 and 0.67s. This also represent the passing of eddies through the shear layer and concentration of the energy of the flow at these instants.
  • 武居 昌宏, 西村浩, 越智光昭, 武居昌宏, 千代田明
    日本機械学会論文集 65(639) 3615-3621 1999年  
  • 武居 昌宏, 越智 光昭, 石川 泰司, 西村 浩, 高木 浩之, 高部 洋一
    日本機械学会論文集. B編 64(628) 4016-4022 1998年12月25日  
    Velocities of particles composing a plug front end have been measured at cross-sectional grids in a pipeline by means of Laser Doppler Velocimeter (LDV) to discuss the movement patterns of the particles. As a result, the velocities at the upper part of the plug front end are higher than those at the lower part. The velocities of the upper particles are higher than the plug movement velocity. These results indicate that the particles composing plug at the front end are discharged toward the front air phase. Moreover, according to the particles movement observations, the particles on the central stationary layer near pipe wall move up to the top part of the plug. The discharged particles are originally lied on the parts. Previous researchers observed the plug particles and calculated the particles velocity in a plug by means of dynamic numerical simulation. Our results qualitatively agree with the simulation results.
  • 武居 昌宏, 上田寛, 武居昌宏, 趙耀輝, 李輝, 越智光昭, 富田侑嗣, 堀井清之
    日本航空宇宙学会誌 46(534) 393-397 1998年  
  • 武居 昌宏
    粉体と工業 29(11) 77-80 1997年11月  
  • 武居 昌宏, 越智 光昭, 高部 洋一
    粉体工学会誌 34(6) 405-410 1997年6月10日  
    Critical plug length at the stage of natural plug formation have been experimentally and theoretically obtained by measuring the length and establishing a deformation model of plug flow. As a result, the measured plug length has been in reasonable agreement with the plug length calculated from the model. The plug length were measured on condition that pipeline was 38mm in diameter and 25m long, particles were 1.5mm diameter polythyelene pellets, and the supply particle flow rate was 0.21kg/s. The aim of this study is to obtain the critical plug length by means of an accurate deformation model when a plug generated and transported in a pipeline. The previous studies have mainly focused on pressure loss calculated from a simple plug model that neglects the plug deformation and consists of only one main body. The deformation model considers the generation and development of a plug. Next it considers an accurate plug shape with three parts: front, main body and rear. The generated plug with three parts develops until the critical length by the balance between kniematic energy and energy losses of the particles. The energy losses result from momentum loss caused by accelerating the stationary layer to the plug flow velocity in the front part, and friction drags acting on inter-particles and pipeline inner wall in the main body.
  • Masahiro Takei, Mitsuaki Ochi, Kiyoshi Horii, Yao Hua Zhao, Hui Li
    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 17 7 1997年  
    A spiral flow system for transporting ceramic balls through a vertical pipe without touching the wall has been developed. This phenomenon has possibility to achieve transportation method with low energy loss. The device to produce spiral flow is a nozzle with an annular slit, attached to the conical cylinder. Pressurized fluid is forced through the side of the device into the buffer area and then through the angled annular slit into the conical cylinder. Due to the Coanda effect of this annular jet attaching to the nozzle wall, the flow downstream develops a spiral structure with steep axial velocity distribution that is much more ordered than typical turbulent flow. This device enables a particle to rotate without touching a vertical pipe inner wall.
  • M Takei, M Ochi
    '96 CHINA-JAPAN SYMPOSIUM ON PARTICUOLOGY, PROCEEDINGS 249-254 1996年  査読有り
  • K Tanaka, M Ochi, M Takei
    '96 CHINA-JAPAN SYMPOSIUM ON PARTICUOLOGY, PROCEEDINGS 237-242 1996年  査読有り
  • 武居 昌宏, M.Ochi, M.Takei
    アドバンストパウダーテクノロジー誌(粉体工学会英文誌) 6(3) 317-324 1996年  
  • 越智 光昭, 武居 昌宏
    日本機械学会論文集 B編 62(600) 2978-2985 1996年  
    In this paper the limiting fluid velocity allowing steady state transport of solids, called the 'minimum transport velocity', is determined with regard to low power consumption. An empirical equation to predict the minimum velocity is derived for fully developed flow in a horizontal pipe, and an experiment on the minimum velocity of coarse particles in the flow is conducted. In the case of a short pipeline, the above mentioned equation gives results which agree relatively well with the experimental data.
  • 武居 昌宏, 堀井 清之, 橋本 文作, 片岡 勲
    資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 111(3) 162-168 1995年3月25日  
  • 武居 昌宏, 堀井 清之, 橋本 文作, 片岡 勲, 伊藤 博幸, 松前 祐司
    日本航空宇宙学会誌 43(494) 129-136 1995年  
    High stability of spiral jet issued from a nozzle, which was designed with an annular slit connected to a conical cylinder, has been clarified by measuring the radial turbulence level and analyzing linearly the amplitude of radial perturbation. The measurement by using laser doppler annemometer indicated that the level of spiral jet was much smaller than that of conventional jet. The linear analysis, which was carried out by difference equation obtained by substituting perturbation into continuity and Euler equation, indicated that the amplitude of the spiral jet was much smaller than that of the conventional jet at the each, radial point. This approximate solution was qualitatively consistent with the experimental results. This high stability of the spiral jet was caused by its steeper axial velocity and its larger radial gradient change of axial velocity near the boundary as compared to the conventional jet.
  • 武居 昌宏, 西川豊, 橋本文作, 片岡勲, 武居昌宏, 松前祐司, 堀井清之
    資源と素材（資源・素材学会誌） 110(1) 61-66 1994年  
  • 武居昌宏
    日本航空宇宙学会誌 42(490) 674-674 1994年  
  • 武居 昌宏, 西川豊, 橋本文作, 片岡勲, 武居昌宏, 松前祐司, 堀井清之
    混相流（日本混相流学会誌） 7(1) 33-40 1993年  
  • 武居 昌宏, 西川豊, 橋本文作, 片岡勲, 武居昌宏, 松前祐司, 堀井清之
    資源と素材（資源・素材学会誌） 109(8) 639-644 1993年  
  • 武居 昌宏, 西川豊, 橋本文作, 片岡勲, 武居昌宏, 松前祐司, 堀井清之
    混相流（日本混相流学会誌） 7(4) 335-343 1993年  
  • K HORII, Y MATSUMAE, XM CHENG, M TAKEI, E YASUKAWA, B HASHIMOTO
    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME 113(1) 149-151 1991年3月  
    A new 90-deg bend shape has been developed for erosion resistance. The design consists of a gradually expanding inlet, a large-diameter curved section, and a gradually contracting outlet. Tests were conducted using alumina particles in air at an average velocity of 27 m/s, passing through a carbon steel bend. The new bend design had an erosion life exceeding 4000 hr, compared to 38 hr for a conventional bend design.
  • K HORII, Y MATSUMAE, XM CHENG, M TAKEI, E YASUKAWA, B HASHIMOTO
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 33(102) 141-153 1991年2月  
    A new nozzle assembly has been developed for an improved focusing of spiral air jet streams. The development of the new nozzle was based on the spiral flow theory. To obtain a focused and highly stable spiral-flow jet, a nozzle is designed with an annular slit connected to a conical cylinder. Pressurized fluid is forced through the sides of the device into the buffer area and then through the annular silt into the pipe entrance. The fluid, passing through the conical cylinder, develops a spiral structure with a steeper axial velocity distribution, caused by Coanda effect and the instability of flow. The jet stream velocity as well as its focusing phenomenon was experimentally determined using a laser sheet method. The flow was visualized by an Ar laser at 48 m.s-1 mean velocity and at a distance up to 2 cm from the nozzle tip. It was found that the spiral flow generated by this new nozzle design is a focused-in flow unlike a turbulent flow produced by the conventional nozzle. The divergence angle is reduced 45%, from 14.3-degrees to 7.8-degrees by using the spiral-flow device to form the jet. Further, the overall jet turbulent-fluctuation level is decreased about 55% by using the spiral flow, from 0.20 to 0.09. These results clearly indicate the focusing characteristic and the high stability of spiral flow jet. Finally, an approximate solution of the spiral flow equation was obtained and the results were compared with the measured velocity distribution.
  • M TAKEI, Y MATSUMAE, XM CHENG, B HASHIMOTO, S ISAGO, A HASHIDATE, K HORII
    THEORETICAL AND APPLIED MECHANICS, VOL 40 40 197-203 1991年  
  • K HORII, Y MATSUMAE, XM CHENG, M TAKEI, B HASHIMOTO
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 32(98) 155-164 1990年2月  
  • K HORII, Y MATSUMAE, XM CHENG, M TAKEI, B HASHIMOTO
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 32(98) 176-183 1990年2月  
  • K HORII, Y MATSUMAE, XM CHENG, M TAKEI, B HASHIMOTO
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 32(98) 165-175 1990年2月  
  • 武居 昌宏, 程暁明, 松前祐司, 武居昌宏, 佐藤高史, 堀井清之
    化学装置 32(3) 89-92 1990年  
  • 武居 昌宏, 程暁明, 松前祐司, 武居昌宏, 佐藤高史, 堀井清之
    化学装置 32(4) 139-142 1990年  
  • 武居 昌宏, 程暁明, 松前祐司, 武居昌宏, 佐藤高史, 堀井清之
    化学装置 32(5) 96-98 1990年  
  • Kiyoshi Horii, Yuji Matsumae, Xiao Ming Cheng, Eiji Yasukawa, Masahiro Takei, Bunsaku Hashimoto
    Journal of The Japan Petroleum Institute 33(5) 291-298 1990年  
    Using a spiral flow, a new effective technique for rope passing for repairing pipelines has been developed. With this technique, useful in petrochemical industries, rope could be passed through a straight pipeline 150 meters long and a roll of vinyl tube 50 meters long, however, using a turbulent flow, other conditions being the same, the rope could not be passed through. To obtain a high speed stable spiral flow, a unit with an annular slit connected to a conical cylinder was used. A pressurized fluid was introduced through this slit, and the fluid passing through the conical cylinder was deformed to a spiral flow having its maximum axial flow at the axis due to the Coanda effect and instability. As a result, the rope was attracted to the axial section of the pipe, increasing the ability and the effectiveness for rope passing work. © 1990, The Japan Petroleum Institute. All rights reserved.
  • 武居 昌宏, 松前祐司, 武居昌宏, 大野浩之, 山内宏太郎, 嘉規香織, 堀井清之, 程暁明
    計測技術 17(1) 79-83 1989年  
  • 武居 昌宏, Y.Matsumae, X.Cheng, M.Takei, K.Horii
    Theoretical and Applied Mechanics 37 73-79 1989年  
  • 武居 昌宏, 松前祐司, 武居昌宏, 大野浩之, 山内宏太郎, 嘉規香織, 堀井清之, 程暁明
    計測技術 17(2) 79-82 1989年  

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  • Yosephus Ardean Kurnianto Prayitno, Yoshiyuki Iso, Tong Zhao, Masahiro Takei
    International Conference on Nuclear Engineering, Proceedings, ICONE 2019年5月18日
    Copyright © 2018-2019 by JSME The demand for high separation efficiency needs an advanced device which can be installed in the separation machinery. To meet this demand, the development of a wireless electrical resistance detector (WERD) was introduced. This research presents particle sedimentation thickness detection method in centrifugal separation system using WERD. The main focus is to observe the particle sedimentation thickness in the specific positions inside an industrial-scale centrifuge. The wireless apparatus has an excellent performance in ultra-high rotation operating speed due to its light weight and flexibility. In this study, the solid phase was represented by acrylic particles of diameter D = 10μm. The acrylic particles were mixed with NaCl solutions and pumped into the centrifuge. As a result, the particle sedimentation thickness nearer to the liquid discharge port is low. Under Re1 = 383.71, the thickness at Z1 = 0.8D and at Z3 = 1.4 are lP1 = 1.15 mm and lP3 = 1.84 mm, respectively. A higher feeding flow rate gives a thicker particle sedimentation thickness. Under Re2 = 1151.15 at Z3 = 1.4D, the particle sedimentation thickness increases by 43%. These results are relative to the constant relative centrifugal force, RCF = 2130G therefore we conclude that the separation efficiency can be optimized by controlling the feeding rate and the rotational velocity of the centrifuge. These findings confirm that WERD is able to monitor the separation process in a centrifuge.
  • Wuqiang Yang, Zhen Ren, Masahiro Takei, Jiafeng Yao
    IST 2018 - IEEE International Conference on Imaging Systems and Techniques, Proceedings 2018年12月14日
    © 2018 IEEE. While electrical capacitance tomography (ECT) and electrical impedance tomography (EIT) have found many successful industrial applications, only recently, research into medical applications of ECT and EIT were carried out at University of Manchester and Chiba University, including (1) Visualization of tooth surface by ECT for tooth canal treatment, (2) Visualization by ECT and EIT for revision hip replacement surgery, (3) Microfluidics for cell sensing and manipulation, (4) Imaging clots in blood flows and (5) Non-intrusive diagnosis of lymph problems. This paper will review the above medical applications of electrical tomography, from necessity of the work or problems to be addressed, sensing principles, experiment arrangement to some initial results. In addition, other research related to medical application of electrical tomography will also be briefly reviewed, such as by Swisstom AG in Switzerland, Dartmouth College in USA and some universities in China.
  • Daisuke Kawashima, Xiayi Liu, Michiko Sugawara, Hiromichi Ohara, Masahiro Takei
    MHS 2017 - 28th 2017 International Symposium on Micro-NanoMechatronics and Human Science 2018年2月28日
    © 2017 IEEE. Electrical impedance spectroscopy (EIS) has been proven to be a useful technique for analyzing biological cell suspensions and tissues because of its capacity of noninvasive measurement. In this paper, the electrical characteristics of medical research council cell strain 5 (MRC-5) are detected by EIS in a multi-layered microchannel. In this research, the equivalent circuit of MRC-5 solution is created by the principle of cell electrical properties. In the experiments, MRC-5 and yeast cells are detected by EIS in multi-layered microchannel, the results reveal that EIS in the micro sensor distinguishes the different cells by their different electrical impedance.
  • The Ninth Thermal and Fluids Engineering Conference(TFEC9) 2017年10月
  • Min-Ho Jeon, Kyung-Youn Kim, Masahiro Takei
    2016 IEEE INTERNATIONAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONFERENCE PROCEEDINGS 2016年 IEEE
    It is important to get reliable measurement data in Electrical impedance tomography (EIT) for getting satisfactory reconstruction result. Because EIT inverse problem is non-linear and ill-posed, incorrect data such as measured data through fault electrode can effect the estimation of resistivity distribution. So, EIT measurement system with methods for checking reliability has been developed. However, most existing methods require extra cost to evaluate reliability of EIT system. This paper presents modified Gauss-Newton (GN) method based on random sample consensus (RANSAC) algorithm for finding fault electrodes and getting good reconstructed image with faulty data for two-phase flow application. Also, suitable residual equation is proposed for determining the threshold to use RANSAC algorithm. Numerical simulations are performed to validate the performance of the proposed method. The results show that the proposed method has a good reconstruction performance compared to the conventional GN method.
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