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On the Pressure Drop and the Velocity Distribution in the Cylindrical Vortex Chamber with Two Inlet Pipes for the Control of Vortex Flow

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Journal of Thermal Science 2005年第2期14卷 162-171页

作者： akira OGAWA Tutomu OONO Hayato OKABE Noriaki AKIBA Taketo OOYAGI 110-0011 Minowa-2-14-7 Taitou-kuTokyoJapanStudents of Nihon University until March of 2005 College of EngineeringDepartment Mechanical EngineeringStudents of Nihon University until March of 2005 College of EngineeringDepartment Mechanical EngineeringStudents of Nihon University until March of 2005 College of EngineeringDepartment Mechanical EngineeringStudents of Nihon University until March of 2005 College of EngineeringDepartment Mechanical Engineering

Vortex flow is applied to a cyclone dust collector, a vortex combustion chamber, and a vortex diode for vortex control. In order to apply the vortex flow to the industries, it is necessary to keep the stable flow condition and to estimate the response time of the transient flow process and also the intensity of the vortex flow. For control vortex flow, two types of vortex chamber with two inlet pipes were designed. One of them is to promote the vortex flow named as Co-Rotating Flow System and another one is to hinder the vortex flow named as Counter-Rotating Flow System. The pressure drops and the velocity distributions were measured for these vortex chambers. The estimation of the tangential velocity by the application of the angular momentum flux is compared with the measured velocity by a cylindrical Pitot-tube. The characteristics of the total pressure drop could be explained by introducing the circulation.

关键词： vortex chamber tangential velocity total and local pressure drops angular momentum flux circulation.

Flow and geochemical modeling of drainage from Tomitaka mine,Miyazaki,Japan

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Journal of Environmental Sciences 2015年第10期27卷 130-143页

作者： Kohei Yamaguchi Shingo Tomiyama Hideya Metugi Hiroyuki Ii akira Ueda Mitsubishi Materials Corporation 1-297 KitabukuroOmiyaSaitama 330-0835Japan Mitsubishi Materials Techno Corporation 1-14-16 KudankitaChiyoda-kuTokyo 102-8205Japan Faculty of Systems Engineering Wakayama University Japan Oil Gas and Metals National Corporation Graduate School Division of Science and Engineering University of Toyama

The chemistry and flow of water in the abandoned Tomitaka mine of Miyazaki, western Japan were investigated. This mine is located in a non-ferrous metal deposit and acid mine drainage issues from it. The study was undertaken to estimate the quantities of mine drainage that needs to be treated in order to avoid acidification of local rivers, taking into account seasonal variations in rainfall. Numerical models aimed to reproduce observed water levels and fluxes and chemical variations of groundwater and mine drainage. Rock–water interactions that may explain the observed variations in water chemistry are proposed. The results show that：（1） rain water infiltrates into the deeper bedrock through a highly permeable zone formed largely by stopes that are partially filled with spoil from excavations（ore minerals and host rocks）;（2） the water becomes acidic（p H from 3 to 4） as dissolved oxygen oxidizes pyrite;（3） along the flow path through the rocks, the redox potential of the water becomes reducing, such that pyrite becomes stable and p H of the mine drainage becomes neutral; and（4） upon leaving the mine, the drainage becomes acidic again due to oxidation of pyrite in the rocks. The present numerical model with considering of the geochemical characteristics can simulate the main variations in groundwater flow and water levels in and around the Tomitaka mine, and apply to the future treatment of the mine drainage.

关键词： Mine drainage Hydrogen isotope Oxygen isotope Rock–water interaction Water movement

Real-time 3D Microtubule Gliding Simulation Accelerated by GPU Computing

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International Journal of Automation and computing 2016年第2期13卷 108-116页

作者： Gregory Gutmann Daisuke Inoue akira Kakugo Akihiko Konagaya Department of Computational Intelligence and Systems Science Tokyo Institute of Technology Faculty of Science Hokkaido University Graduate School of Chemical Sciences and Engineering Hokkaido University

A microtubule gliding assay is a biological experiment observing the dynamics of microtubules driven by motor proteins fixed on a glass surface. When appropriate microtubule interactions are set up on gliding assay experiments, microtubules often organize and create higher-level dynamics such as ring and bundle structures. In order to reproduce such higher-level dynamics on computers, we have been focusing on making a real-time 3D microtubule simulation. This real-time 3D microtubule simulation enables us to gain more knowledge on microtubule dynamics and their swarm movements by means of adjusting simulation paranleters in a real-time fashion. One of the technical challenges when creating a real-time 3D simulation is balancing the 3D rendering and the computing performance. Graphics processor unit （GPU） programming plays an essential role in balancing the millions of tasks, and makes this real-time 3D simulation possible. By the use of general-purpose computing on graphics processing units （GPGPU） programming we are able to run the simulation in a massively parallel fashion, even when dealing with more complex interactions between microtubules such as overriding and snuggling. Due to performance being an important factor, a performance n, odel has also been constructed from the analysis of the microtubule simulation and it is consistent with the performance measurements on different GPGPU architectures with regards to the number of cores and clock cycles.

关键词： Microtubule gliding assay 3D computer graphics and simulation parallel computing performance analysis general- purpose computing on graphics processing units (GPGPU) compute unified device arshitecture (CUDA) DirectX.

POD analysis of the instability mode of a low-speed streak in a laminar boundary layer

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Acta Mechanica Sinica 2017年第6期33卷 981-991页

作者： Si-Chao Deng Chong Pan Jin-Jun Wang akira Rinoshika Fluid Mechanics Key Laboratory of Ministry of Education Beijing University of Aeronautics and Astronautics Department of Mechanical Systems Engineering Yamagata University

The instability of one single low-speed streak in a zero-pressure-gradient laminar boundary layer is investigated experimentally via both hydrogen bubble visualization and planar particle image velocimetry(PIV) measurement. A single low-speed streak is generated and destabilized by the wake of an interference wire positioned normal to the wall and in the upstream. The downstream development of the streak includes secondary instability and self-reproduction process, which leads to the generation of two additional streaks appearing on either side of the primary one. A proper orthogonal decomposition(POD) analysis of PIV measured velocity field is used to identify the components of the streak instability in the POD mode space: for a sinuous/varicose type of POD mode, its basis functions present anti-symmetric/symmetric distributions about the streak centerline in the streamwise component, and the symmetry condition reverses in the spanwise component. It is further shown that sinuous mode dominates the turbulent kinematic energy(TKE) through the whole streak evolution process, the TKE content first increases along the streamwise direction to a saturation value and then decays slowly. In contrast, varicose mode exhibits a sustained growth of the TKE content,suggesting an increasing competition of varicose instability against sinuous instability.

关键词： Low-speed streak Boundary layer transition Streak instability

Study on Shock Wave and Turbulent Boundary Layer Interactions in a Square Duct at Mach 2 and 4

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Journal of Thermal Science 2006年第1期15卷 37-42页

作者： Hiromu SUGIYAMA Ryojiro MINATO Kazuhide MIZOBATA akira TOJO Yohei MUTO Department of Mechanical Systems Engineering Muroran Institute of Technology 27-1 Mizumoto Muroran Hokkaido 050-8585 Japan Graduate School Muroran Institute of Technology

In this paper, the outline of the Mach 4 supersonic wind tunnel for the investigation of the supersonic internal flows in ducts was firstly described. Secondly, the location, structure and characteristics of the Mach 2 and Mach 4 pseudo-shock waves in a square duct were investigated by color schlieren photographs and duct wall pressure fluctuation measurements. Finally, the wall shear stress distributions on the side, top and bottom walls of the square duct with the Mach 4 pseudo-shock wave were investigated qualitatively by the shear stress-sensitive liquid crystal visualization method. The side wall boundary layer separation region under the first shock is narrow near the top wall, while the side wall boundary layer separation region under the first shock is very wide near the bottom wall.

关键词： supersonic internal flow pseudo-shock wave flow visualization shear stress-sensitive liquid crystal.

Hepatoid carcinoma of the pancreas mimicking neuroendocrine tumor

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Hepatobiliary Surgery and Nutrition 2018年第6期7卷 501-502页

作者： Kentaro Fukushima akira Kobayashi First Department of Surgery Shinshu University School of MedicineMatsumotoJapan

A 44-year-old man was admitted to our hospital for further investigation of a tumor in the pancreatic *** had no symptoms or chronic liver *** hormones,CEA,and CA19-9 were *** alpha-fetoprotein and des-gamma-carboxy p... 详细信息

关键词： admitted pancreas assessed

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： Rotating disk Scattering droplet Visualization Particle tracking velocimetry

The methodology of lymphatic anatomy studies in a cadaver model: an overview

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Plastic and Aesthetic Research 2019年第12期6卷 50-60页

作者： Hiroo Suami akira Shinaoka Australian Lymphoedema Education Research and Treatment ProgramFaculty of Medicine and Health SciencesMacquarie UniversitySydneyNSW 2109Australia Department of Human Morphology Okayama University Graduate School of MedicineDentistryand Pharmaceutical ScienceOkayama 700-8558Japan

The lymphatic system is the area least investigated in the field of anatomical *** major reason for this is the technical difficulty in identifying the lymphatics in the surrounding tissue in post-mortem *** a result,the medical illustration masterpieces crafted by pioneer anatomists on the basis of cadaver dissections remain a vital component of current anatomical *** innovative techniques were developed in the past to allow anatomists to distinguish the transparent lymphatic structures from their surroundings and enable thorough investigation of the lymphatic system in a cadaver *** paper focuses on these techniques,including the current technique developed by the authors themselves.

关键词： Anatomy lymphatic system cadaver mercury indocyanine green

Medaka factor in the germline alpha(figα)is indispensable for oogenesis but not for gonadal sex differentiation

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Aquaculture and Fisheries 2024年第3期9卷 347-354页

作者： Katsuyasu Kamimura Masato Kinoshita akira Kanamori Division of Biological Science Graduate School of ScienceNagoya UniversityNagoyaAichi464-8602Japan Division of Applied Biosciences Graduate School of AgricultureKyoto UniversityKyoto606-8502Japan

A basic helix-loop-helix transcription factor,figα,is one of the earliest marker genes of oocyte differentiation in *** the present study,we made figαknockout medaka by CRISPR/Cas9,expecting aborted progress of oogenesis,to see if differentiation of somatic ovarian tissues is ***αknockout male gonads differentiated normally into testes with functional *** females,on the other hand,were sterile;there are oocytes only up to *** growing oocytes in diplotene were *** phenotype was already apparent at 10 days after hatching,when diplotene oocytes start to develop in the ***,several putative target genes of figαwere not expressed in the mutant female *** studies showed that medaka lacking germ cells have morphologically abnormal gonads and female to male sex reversal ***αknockout female gonads differentiated morphologically into ovaries,suggesting that in medaka,figαknockout prevents oogenesis progress into diplotene stage,and ovarian differentiation do not need developed oocytes beyond pachytene *** ovarian phenotype reminded us of"pachytene checkpoint",which blocks meiotic progress into diplotene when chromosomal abnormalities are ***,we further analyzed phenotype of oocytes in the mutant *** number of oocytes at each meiotic stage suggested that oogenesis normally proceeded up to pachytene *** number of apoptotic oocytes in the knockout ovaries was ***,we did not detect any abnormal pairings or unrepaired double-strand breaks by *** together,figαknockout likely stop oocyte growth at or around pachytene via unknown mechanisms other than"pachytene checkpoint"and arrested oocytes remained in the *** is in contrast to figαknockout mice where all oocytes underwent apoptosis quickly after birth.

关键词： bHLH transcription factor CRISPR/Cas9 Pachytene checkpoint Oocyte growth Medaka