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Contributions of the Secondary Jet to the Tangential Velocity Distribution and to the Collection Efficiency of the Fixed Guide Vane Type Axial Flow Cyclone Dust Collector

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Journal of Thermal Science 2015年第6期24卷 503-509页

作者： akira Ogawa Hideki Anzou So Yamamoto Mituru Shimagaki Tokyo Japan

In order to control the maximum tangential velocity V?m(m/s)of the turbulent rotational air flow and the collection efficiencyηc(%)using the fly ash of the mean diameter X R50=5.57?m,two secondary jet nozzles were installed to the body of the axial flow cyclone dust collector with the body diameter D1=*** in order to estimate V?m(m/s),the conservation theory of the angular momentum flux with Ogawa combined vortex model was *** comparisons of the estimated results of V?m(m/s)with the measured results by the cylindrical Pitot-tube were shown in good *** also the estimated collection efficienciesηcth(%)basing upon the cut-size Xc(?m)which was calculated by using the estimated V?m(m/s)and also the particle size distribution R(Xp)were shown a little higher values than the experimental results due to the re-entrainment of the collected *** best method for adjustment ofηc(%)related to the contribution of the secondary jet flow is principally to apply the centrifugal effect?c(1).Above stated results are described in detail.

关键词： Axial Flow Cyclone Dust Collector Maximum Tangential Velocity Cut-Size Particle Size Distribution Collection Efficiency Reynolds number Centrifugal Effect

Acoustic Noise from Tandem Wind Rotors of Intelligent Wind Power Unit

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Journal of Thermal Science 2010年第2期19卷 120-125页

作者： Koichi Kubo Nobuhiko Mihara akira Enishi Toshiaki Kanemoto Kyushu Institute of Technology:Sensui 1-1

The authors had invented the unique wind power unit composed of the large-sized front wind rotor,the small-sized rear wind rotor and the peculiar generator with the inner and the outer rotational armatures without the conventional *** unit is called "Intelligent Wind Power Unit" by the *** front and the rear wind rotors drive the inner and the outer armatures,respectively,while the rotational torque is counter-balanced between both armatures/wind *** paper discusses experimentally the acoustic noise from the front and the rear wind *** acoustic noise,in the counter-rotating operation,is induced mainly from the flow interaction between both rotors,and has the dominant power spectrum density at the frequency of the blade passing *** noise is caused mainly from the turbulent fluctuation due to the flow separation on the blade,when the rear wind rotor stops or rotates in the same direction as the front wind rotor.

关键词： Acoustic noise Wind turbine Tandem wind rotors Counter-rotation

Possible source and migration pathway for early-summer immigrants of the oriental armyworm, Mythimna separata, arriving in northern Japan

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Journal of Integrative Agriculture 2023年第11期22卷 3474-3488页

作者： akira OTUKA Tokumitsu NIIYAMA JIANG Xing-fu Institute for Plant Protection National Agriculture and Food Research OrganizationKoshi 861-1102Japan Akita Plant Protection Station Akita 010-1232Japan Institute of Plant Protection Chinese Academy of Agricultural SciencesBeijing 100193P.R.China

The first generation of the oriental armyworm, Mythimna separata(Walker), arrives every year in northern Japan in mainly late May to early June. Analyses of weather maps suggested that this moth’s immigration source could be eastern China, but the accuracy of those analyses was very limited due to the lack of a current standard trajectory analysis. The management of migratory insect pests such as M. separata benefits from the identification of the migration source(s)and pathway(s) of the pests. The present study provides a trajectory analysis for M. separata. Backward trajectories from trap sites in northern Japan were calculated with the HYSPLIT System developed by the U.S. National Oceanic and Atmospheric Administration, taking the flight speed of M. separata and the limitation of low ambient temperature at flight height into account. The ending times of the moth’s short and long trajectories were set at dusk on the day before and two days before the possible arrival date, respectively. The results suggested two types of possible migration pathway: a multi-step pathway from Northeast China, the Korean Peninsula, and eastern Russia, which are destination areas of the first-generation’s migration, and a direct pathway from seasonal main emigration areas in eastern China such as Jiangsu and Shandong provinces. These findings contribute to our understanding of the migration ecology of M. separata and can be used for the development of methods to predict the migration of this insect.

关键词： migration backward trajectory oriental armyworm first generation East Asia

Estimation of the Radial Distribution of the Tangential Velocity in a Vortex Chamber

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Journal of Thermal Science 2009年第1期18卷 27-32页

作者： akira OGAWA Tsuyoshi IKARI Hiroyuki MURAKAMI Kouhei SATHO T-110-0011 Minowa 2-14-7 Taitou-Ku Tokyo Japan AQUAS .Co.Ltd. Japan The Marine Self Defense Force Japan GMA Co.Ltd. Japan

The estimation of maximum tangential velocity becomes a very important factor for the estimation of performancesof the vortex chamber. In this paper, a proposed flow model of how to estimate the maximum tangential velocity inthe special form of the vortex chamber is described in detail. The pressure drop basing upon the rapid expansion byflowing from the inlet pipe into the cyclone body is estimated as half of the dynamic pressure in the inlet pipe.

关键词： Vortex chamber tangential velocity angular momentum flux Reynolds number

Application of multi-dimensional wavelet transform to fluid mechanics

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Theoretical & Applied Mechanics Letters 2020年第2期10卷 98-115页

作者： akira Rinoshika Hiroka Rinoshika School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China Department of Mechanical Systems Engineering Graduate School of Science and Engineering Yamagata University 4-3-16 JonanYonezawa-shiYamagata 992-8510Japan

This paper first reviews the application research works of wavelet transform on the fluid mechanics. Then the theories of continuous wavelet transform and multi-dimensional orthogonal(discrete) wavelet transform, including wavelet multiresolution analysis, are introduced. At last the applications of wavelet transform on 2 D and 3 D turbulent wakes and turbulent boundary layer flows are described based on the hot-wire, 2 D particle image velocimetry(PIV) and 3 D tomographic PIV.

关键词： Continuous wavelet transform Fluid mechanics Multi-scale flow structures Orthogonal wavelet transform Turbulence Wavelet multiresolution analysis

Three-dimensional motion analysis for evaluating motor function in rodents with peripheral nerve injury

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Neural Regeneration Research 2019年第12期14卷 2077-2078页

作者： akira Ito Wang Tianshu Junichi Tajino Department of Motor Function Analysis Human Health Sciences Graduate School of Medicine Kyoto University Kyoto Japan Department of Development and Rehabilitation of Motor Function Human Health Sciences Graduate School of Medicine Kyoto University Kyoto Japan

Peripheral nerves act like networks of “wires” that conduct signals from the brain and spinal cord to organs throughout the body. Damage to these nerves leads to numbness, pain, and weakness that eventually reduces the patient’s quality of life. Fortunately, peripheral nerves have a high regenerative capacity and, in most cases, recover from mild disorders and injuries. However, there have been continuous challenges facing the development of treatments for peripheral nerve conditions such as disorders that occur through chronic mechanical stimulation like carpal tunnel syndrome, disorders due to side effects from drugs and intractable diseases like chronic inflammatory demyelinating polyneuropathy.

关键词： motion analysis function nerves

DISCOVERY OF β-LACTAM ANTIBIOTICS WITH NOVEL NUCLEI

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中国抗生素杂志 1984年第1期9卷 67-82页

作者： akira Imada Biology Laboratories Central Research Division Japan Ltd Juso Osaka 532 Takeda Chemical Industries Yodogawa-ku

The discovery of penicillin in1929,and cephalosporin in 1956 leadto the development of new semisynthetic β-lactam antibiotics by the acylation of 6-aminopenicillanic acid and 7aminocephalosporanic acid. Success withthese antibiotics, which were of greatclinical value, stimulated the pharmaceutical industry to search for new β-lactam antibiotics,and a variety of newmethodologies were established andapplied to their *** a result,many β-lactam antibiotics with novelnuclei were discovered from microbialsources, mainly from actinomycetes and

关键词： LACTAM ANTIBIOTICS WITH NOVEL NUCLEI DISCOVERY OF OCH

Recent Progress on Fiber-Based Optical Components

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光学学报 2003年第S1期23卷 233-234页

作者： akira Wada Optics and Electronics Laboratory Fujikura Ltd. 1440 Mutsuzaki Sakura Chiba 285-8550 Japan

The trends of fiber-based optical component technologies are reviewed focusing on fused-taper couplers and fiber Bragg gratings for high bit-rate DWDM transmission systems.

关键词： been in as with of FBG Recent Progress on Fiber-Based Optical Components have on

Nature of complex number and complex-valued neural networks

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Frontiers of Electrical and Electronic Engineering in China 2011年第1期6卷 171-180页

作者： akira HIROSE Department of Electrical Engineering and Information Systems The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

We discuss the nature of complex number and its effect on complex-valued neural networks(CVNNs).After we review some examples of CVNN applications,we look back at the mathematical history to elucidate the features of complex number,in particular to confirm the importance of the phaseand-amplitude viewpoint for designing and constructing CVNNs to enhance the *** viewpoint is essential in general to deal with waves such as electromagnetic wave and ***,we point out that,although we represent a complex number as an ordered pair of real numbers for example,we can reduce ineffective degree of freedom in learning or self-organization in CVNNs to achieve better generalization *** merit is significantly useful not only for waverelated signal processing but also for general processing with frequency-domain treatment through Fourier transform.

关键词： electromagnetic wave lightwave coherence adaptive processing in sensing and imaging learning logic neural hardware