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Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser(Noise Reduction by means of Small Groove Located at LSD Blade Leading Tip)

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Journal of Thermal Science 2009年第4期18卷 321-324页

作者： Tengen MURAKAMI masahiro ISHIDA Daisaku SAKAGUCHI Yu KOBA Graduate School of Science and Technology Nagasaki University

This paper deals with the effect of the blade tip-groove of the low solidity cascade diffuser (LSD) on the blowercharacteristic and the noise generated by the LSD. The small grooves were set up at the root and/or tip near theleading edge of the LSD blade. In order to clarify the mechanism of noise increase due to LSD and also to reducethe noise, the relationships between the noise increase based on the LSD, the LSD performance and the secondaryflow formed additionally by the tip-groove were investigated experimentally as well as numerically, especiallyanalyzing flow behaviors in the LSD in view points of flow separation on the suction surface of the LSD bladeand the secondary flow on the side walls. By reducing the stagnation region smaller near the root and/or tip of theLSD blade leading edge, the secondary flow behavior changes remarkably around the LSD blade, as a result, thenoise level and the blower characteristics vary. It can be concluded that, by means of a small tip-groove locatedonly at the shroud side near the LSD blade leading edge, the noise generated by the LSD can be reduced withoutdeteriorations of the LSD performance and the blower characteristics as well.

关键词： Centrifugal blower Low solidity cascade diffuser Noise Diffuser performance Secondary flow

A fate model of pathogenic viruses in a composting toilet based on coliphage inactivation

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Journal of Environmental Sciences 2011年第7期23卷 1194-1198页

作者： Shinobu Kazama Narue Tameike Naoko Nakagawa masahiro Otaki Department of Human Environmental Science Ochanomizu University INAX Co. 1-23-6 Yoshino-cho Kita-ku Satiama 331-0811 Japan Department of Civil and Environmental Engineering Tokyo Metropolitan University 1-1 Minamiosawa Hachioji City Tokyo 192-0397 Japan

A composting toilet using sawdust as a matrix has the potential to trap pathogens that might occasionally be contained in human feces. Therefore, care should be taken when handling the sawdust. It should also be noted that pathogenic viruses tend to have stronger tolerance than pathogenic bacteria. The fates of several species of coliphages, T4, λ, Qβ and MS2, in sawdust were investigated as a viral model. The fates of coliphages were significantly different among them, and they changed in response to temperature and the water content of the sawdust. As the results, T4 coliphage had the strongest tolerance and Qβ had the weakest one in sawdust. It was estimated the days required to decrease virus to a safe level based on a risk assessment. According to the rates of Qβ and T4, 15 days and 167 days were required respectively for a safe level of infection risk based on actually operated composting toilet condition. Thus, it was significantly different depending on the species and sawdust conditions.

关键词： composting toilet viral indicator coliphage risk assessment

Effects of selenium-containing compounds on Cu^(2+)/Zn^(2+)-induced neuronal cell death and potential application as therapeutic agents for neurological diseases

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Neural Regeneration Research 2022年第2期17卷 311-312页

作者： Ken-ichiro Tanaka Mikako Shimoda masahiro Kawahara Department of Bio-Analytical Chemistry Faculty of PharmacyMusashino UniversityShinmachiNishitokyoTokyoJapan

In many tissues, trace metals such as iron(Fe), zinc(Zn), and copper(Cu) are important for various physiological functions such as immune function, cell division, and enzyme function. However, it has been shown in humans and experimental animal models that excessive amounts of these trace metals in the body can induce various diseases in the central nervous system, liver.

关键词： metals potential copper

Better Platooning toward Autonomous Driving:Inter-Vehicle Communications with Directional Antenna

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China Communications 2021年第7期18卷 44-57页

作者： Xiaoyan Wang Diquan Wang Nobuhiro Ariyasu masahiro Umehira Graduate School of Science and Engineering Ibaraki UniversityHitachi 316-8511Japan Japan Hi-Think Corporation Kyoto 600-8815Japan Hitachi Automotive Systems Ltd.Hitachinaka 312-8503Japan

Recently,in the researches on vehicular Internet-of-Things(IoT),platooning have received lots of attentions due to its potential to improve the fuel efficiency and driving *** is a group of vehicles that act as smart agents,they travel collaboratively by following the leading human-driven vehicle.A vehicle in the platoon utilizes radar and wireless communication to share important information to other vehicles in the same platoon such as speed and acceleration,to realize the safe and efficient *** quality of wireless communication is of great importance to manage and maintain the ***,in a scenario that a large number of vehicles exist,communication delay and packet loss caused by channel congestion may endanger the safe intervehicle *** this paper,we introduce intervehicle communication with directional antenna into *** extensive simulations,we evaluate the packet delay and inter-vehicle distance in both normal driving and braking scenarios,and verify the usefulness of directional antenna in platooning for vehicular IoT.

关键词： vehicular IoT inter-vehicle communications directional antenna platoon safety

Measurement of droplet size distribution in core region of high-speed spray by micro-probe L2F

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Journal of Thermal Science 2008年第1期17卷 90-96页

作者： Daisaku Sakaguchi Oluwo le Amida Hironobu Ueki masahiro Ishida Graduate School of Science and Technology Nagasaki University1-14 Bunkyo-machi Nagasaki 852-8521 JAPAN Faculty of Engineering Nagasaki University Professor

In order to investigate the distribution of droplet sizes in the core region of diesel fuel spray, instantaneous measurement of droplet sizes was conducted by an advanced laser 2-focus velocimeter （L2F）. The micro-scale probe of the L2F is made up of two foci and the distance between them is 36 lain. The tested nozzle had a 0.2 mm diameter single-hole. The measurements of injection pressure, needle lift, and crank angle were synchronized with the measurement by the L2F at the position 10 mm downstream from the nozzle exit. It is clearly shown that the droplet near the spray axis is larger than that in the off-axis region under the needle full lift condition and that the spatial distribution of droplet sizes varies temporally. It is found that the probability density distribution of droplet sizes in the spray core region can be fitted m the Nukiyama-Tanasawa distribution in most injection periods.

关键词： droplet disintegration optical characterization laser 2-focus velocimeter

DEVELOPMENT OF DIRECT UPGRADING PROCESS FOR HEAVY CRUDE OIL

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石油学报（石油加工） 2001年第1期17卷 101-106页

作者： masahiro YOSHIDA Nobuyuki OTA Technical cooperation project research & development dept. Idemitsu kosan Co LTD 24-4 Anesaki-Kaigan Ichihara，Chiba 299-0107Japan Central research lab. Idemitsum kosan Co LTD1280Kaini-Izumi Sodegaura-City Chiba 299-0293Japan

The direct upgrading process from heavy crude oil to sweet and light oil (IKC process) has been deve loped for about 10 years in Idemitsu Kosan. Compared with conventional refinery scheme consisting of YR HDS, VGOHYC and so on, the new refinery scheme combined with IKC process and Topper was always economically feasible with lower cost and smaller energy consumption. In the existing refinery of no middle distillate HDS and residue HDS of HYC plants to supplement IKC process is expected to be one of the efficient methods to cope with the environmental regulations.

关键词：重质油直接浓缩工艺 IKC 环境管理原油处理

Harmonic Measures and Numerical Computation of Cauchy Problems for Laplace Equations

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Chinese Annals of Mathematics,Series B 2023年第6期44卷 913-928页

作者： Yu CHEN Jin CHENG Shuai LU masahiro YAMAMOTO School of Mathematics Shanghai University of Finance and EconomicsShanghai 200433China. School of Mathematical Sciences Fudan UniversityShanghai 200433China School of Mathematical Sciences the University of TokyoTokyo 153Japan

It is well known that the Cauchy problem for Laplace equations is an ill-posed problem in Hadamard’s *** deviations in Cauchy data may lead to large errors in the *** is observed that if a bound is imposed on the solution,there exists a conditional stability *** gives a reasonable way to construct stable ***,it is impossible to have good results at all points in the *** numerical methods for Cauchy problems for Laplace equations have been widely studied for quite a long time,there are still some unclear points,for example,how to evaluate the numerical solutions,which means whether they can approximate the Cauchy data well and keep the bound of the solution,and at which points the numerical results are reliable?In this paper,the authors will prove the conditional stability estimate which is quantitatively related to harmonic *** harmonic measure can be used as an indicate function to pointwisely evaluate the numerical result,which further enables us to find a reliable subdomain where the local convergence rate is higher than a certain order.

关键词： Conditional stability Cauchy problem Laplace equation Indicate function

Behaviors of Spherical and Nonspherical Particles in a Square Pipe Flow

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Communications in Computational Physics 2011年第5期9卷 1179-1192页

作者： Takaji Inamuro Hirofumi Hayashi masahiro Koshiyama Department of Aeronautics and Astronautics Graduate School of EngineeringKyoto UniversityKyoto 606-8501Japan Advanced Research Institute of Fluid Science and Engineering Graduate School of EngineeringKyoto UniversityKyoto 606-8501Japan

The lattice Boltzmann method(LBM)for multicomponent immiscible fluids is applied to the simulations of solid-fluid mixture flows including spherical or nonspherical particles in a square pipe at Reynolds numbers of about 100.A spherical solid particle is modeled by a droplet with strong interfacial tension and large viscosity,and consequently there is no need to track the moving solid-liquid boundary ***(discoid,flat discoid,and biconcave discoid)solid particles are made by applying artificial forces to the spherical *** is found that the spherical particle moves straightly along a stable position between the wall and the center of the pipe(the Segr´e-Silberberg effect).On the other hand,the biconcave discoid particle moves along a periodic helical path around the center of the pipe with changing its orientation,and the radius of the helical path and the polar angle of the orientation increase as the hollow of the concave becomes large.

关键词： Lattice Boltzmann method square pipe flow spherical particle biconcave discoid particle

Development of Bio-cultured Artificial Muscles with High Design Flexibility

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Journal of Bionic Engineering 2023年第4期20卷 1635-1645页

作者： Hirono Ohashi Shunsuke Shigaki Ryo Teramae masahiro Shimizu Koh Hosoda Department of Systems Innovation Osaka University1-2MachikaneyamaToyonakaOsaka560-0043Japan

Recent advances in bionics have made it possible to create various tissue and *** this cell culture technology,engineers have developed a robot driven by three-dimensional cultured muscle cells(bioactuator)—a muscle cell *** more applications,researchers have been developed various tissues and organs with bio3D ***,three-dimensional cultured muscle cells printed by bio3D printer have been not used for muscle cell robot *** aim of our study is to develop easy fabrication method of bioactuator having high design flexibility like as bio3D *** fabricated three-dimensional cultured muscle cells using mold and dish having pin which can contribute to shape and cell *** this study,we observed that our method maintained the shape of three-dimensional cultured muscle cells and caused cell alignment which is important for bioactuator *** named three-dimensional cultured muscle cells developed in this study“bio-cultured artificial muscle(BiCAM)”.Finally,we observed that BiCAM contracted in response to electrical *** these data,we concluded our proposed method is easy fabrication method of bioactuator having high design flexibility.

关键词： Three-dimensional cultured muscle cells Bio-cultured artificial muscle Skeletal muscle cell Tissue engineering