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Computer-generated image hologram

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Chinese Optics Letters 2011年第12期9卷 20-23页

作者： Takeshi Yamaguchi Hiroshi yoshikawa Department of Electronics and Computer Science College of Science and Technology

We investigate the computer-generated hologram with full parallax and which can be reconstructed with white light. The object of the hologram is processed from three-dimensional computer graphics polygon data and has shaded surface for hidden surface removal. The optically reconstructed image from the printed hologram is evaluated.

关键词： Computer-generated image hologram CGH

Optimization of the gain in Yb^(3+)-doped cubic laser crystals of 99.99% purity

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Journal of Rare Earths 2009年第4期27卷 616-618页

作者： Georges Boulon Yannick Guyot Akira yoshikawa Physical Chemistry of Luminescent Materials University Claude Berna rd/Lyon1 UMR 5620 CNRS Bt.A.Kastler Domaine Scientifique de La Doua 69622 Villeurbanne France IMRAM Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan

This was an outlook on the prediction of the infrared laser potentiality from concentration dependences of the 2F5/2 experimental decay time in Yb3＋-doped solid-state crystals mainly on cubic crystals with 99.99% pur... 详细信息

关键词： ytterbium fluoride garnet sesquioxide laser crystals concentration quenching self trapping lifetime

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

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

作者： Mizue Munekata Naoya Jobi keiichiro kubo Hiroyuki yoshikawa Department of Mechanical System Engineering Kumamoto University

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

关键词：边界层特征轨道运动旋转盘瞬态涡旋轨道半径实验检查速度波动

Microwave enhanced stabilization of copper in artificially contaminated soil

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Frontiers of Environmental Science & Engineering 2011年第2期5卷 205-211页

作者： Hua ZHANG Zhiliang ZHU Noboru yoshikawa State key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Graduate School of Environmental Studies Tohoku UniversitySendai 980-8579Japan

Microwave processing was used to stabilize copper ions in soil *** effects on the stabilization efficiency were studied as a function of additive,microwave power,process time,and reaction *** stabilization efficiency of the microwave process was evaluated based on the results of the toxicity characteristic leaching procedure(TCLP)*** results showed that the optimal experimental condition contained a 700W microwave power,20 min process time and 3 iron wires as the additive,and that the highest stabilization efficiency level was more than 70%.In addition,the different reaction atmospheres showed no apparent effect on the stabilization efficiency of copper in the artificially contaminated *** to the result of the Tessier sequential extraction,the partial species of copper in the contaminated soil was deduced to transform from unstable species to stable states after the microwave process.

关键词： microwave copper stabilization

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

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

作者： Hiroyuki yoshikawa Tomonori kAI Mizue MUNEkATA Hideki OHBA Dept.of Mechanical System Engineering Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan kikuyo KikuchiKumamoto 869-1101Japan

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

关键词：分离流动强化传热脉动流 Strouhal数临界雷诺数矩形通道频道斯特劳哈尔数

An Experimental Study on Aerodynamic Sound Generated from Wake Interaction of Circular Cylinder and Airfoil with Attack Angle in Tandem

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Journal of Thermal Science 2008年第3期17卷 212-217页

作者： Mizue MUNEkATA Ryuta kOSHIISHI Hiroyuki yoshikawa Hideki OHBA Department of Mechanical System Engineering

在我们的以前的学习，在空气动力学的声音上的柱体和机翼之间的间隔的效果被调查并且与单个圆形、单个的机翼的案例相比。在这研究，机翼的攻击角度的效果在空气动力学的声音的特征上定位了 downstream， wake 结构在在柱体和机翼之间... 详细信息

在我们的以前的学习，在空气动力学的声音上的柱体和机翼之间的间隔的效果被调查并且与单个圆形、单个的机翼的案例相比。在这研究，机翼的攻击角度的效果在空气动力学的声音的特征上定位了 downstream， wake 结构在在柱体和机翼之间的给定的间隔被调查。DFN 和山峰频率的健全压力水平与因为，增加机翼的攻击角度减少，这被发现散开由于圆形的柱体的增加的反应弄醒结构，它被机翼的堵住的效果引起。健全来源被通信到流旋涡形式的攻击点，这被显示出在上游的圆形的柱体到下游的机翼。我们断定在机翼表面的压力变化在健全压力水平上完成，从流动可视化和健全来源的探索测试。

关键词：空气动力学尾流圆柱机翼

Sepsis caused by endoscopic clipping for colonic diverticular bleeding: A rare complication

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World Journal of Gastroenterology 2009年第30期15卷 3817-3818页

作者： keiichiro kume Masahiro Yamasaki Ichiro yoshikawa Third Department of Internal Medicine University of Occupational and Environmental HealthJapanSchool of MedicineKitakyusyu 807-8555Japan

We herein report the rare complication of sepsis caused by endoscopic clipping for colonic diverticular bleeding. A 78-year-old man with a 12-h history of near syncope and painless hematochezia was admitted to our hospital. Following the transfusion of 4 U of blood and continued hematochezia, a colonoscopy was performed. Active bleeding was seen as continuous arterial spurting from a single diverticulum located in the middle ascending colon. This diverticulum was seamed by four endoclips. The next day, the patient became febrile with a temperature of 39.2℃. Laboratory data included a white blood cell count of 18 100/mm3 and a C-reactive protein level of 3.4 mg/dL. He was diagnosed with sepsis since Escherichia coli was detected in the blood culture. Antibiotics were started. Four days later his fever had improved and laboratory data improved 9 d later.

关键词：结肠镜败血症并发症出血内镜剪辑蛋白水平大肠杆菌

Scattering Characteristics of Liquid Droplets Spun Off from Rotating Disk Edge

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Journal of Thermal Science 2012年第1期21卷 42-48页

作者： Mizue MUNEkATA Akira NOGUCHI Jun NISHIYAMA Hiroaki kURISHIMA Hiroyuki yoshikawa Dept. of Mech. System Eng. Kumamoto University 2-39-1 Kurokami Tokyo Electron kyushu Ltd. Fukuhara

Scattering characteristics of liquid droplets spun off from a rotating disk edge are experimentally investigated. In the present research, aluminum disks are utilized and ethanol is employed for liquid. Scattering phenomena of the droplets are captured by the high-speed digital camera. Frequency distribution of the droplet diameter is evaluated from these images and distributions of horizontal flying velocity and angle of the droplets were measured by PTV. Liquid filaments are stretched outward from the stagnant liquid layer by centrifugal force and skew complicatedly by aerodynamic force. Some peaks appear in the distribution of the scattered droplet diameter and they are origi- nated from large terminal droplets and small droplets generated from filamentwise breakup. Most of the scattered droplets fly slightly inside in the tangential direction of the disk edge. The droplets spun off from the thin disk scatter widely compared with that from the thick one.

关键词：液滴直径分布散射特性旋转盘剥离液体层数码相机分布计算飞行速度

Pilot scale autothermal gasification of coconut shell with CO2-O2 mixture

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Frontiers in Energy 2015年第3期9卷 362-370页

作者： Bayu PRABOWO Herri SUSANTO kentaro UMEkI Mi YAN kunio yoshikawa Department of Environmental Science and Technology Tokyo Institute of Technology Yokohama 226-8503 Japan Institute of Energy and Power Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Chemical Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Division of Energy Science Lulea University of Technology Lulea 971 87 Sweden Institute of Energy and Power Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Environmental Science and Technology Tokyo Institute of Technology Yokohama 226-8503 Japan

This paper explored the feasibility and benefit of CO2 utilization as gasifying agent in the autothermal gasification process. The effects of CO2 injection on reaction temperature and producer gas composition were examined in a pilot scale downdraft gasifier by varying the CO2/C ratio from 0.6 to 1.6. O2 was injected at an equivalence ratio of approximately 0.33-0.38 for supply- ing heat through partial combustion. The results were also compared with those of air gasification. In general, the increase in CO2 injection resulted in the shift of combustion zone to the downstream of the gasifier. However, compared with that of air gasification, the long and distributed high temperature zones were obtained in CO2-O2 gasification with a CO2/C ratio of 0.6-1.2. The progress of the expected CO2 to CO conversion can be implied from the relatively insignificant decrease in CO fraction as the CO2/C ratio increased. The producer gas heating value of CO2-O2 gasification was consistently higher than that of air gasification. These results show the potential of CO2-O2 gasification for producing high qualityproducer gas in an efficient manner, and the necessity for more work to deeply imply the observation.

关键词： keywords biomass gasification CO2 downdrafl gasifier,autothermal