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Numerical Simulation on Supersonic Flow in High-Velocity Oxy-Fuel Thermal Spray Gun

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Journal of Thermal Science 2006年第1期15卷 65-70页

作者： hiroshi KATANODA Hideki YAMAMOTO Kazuyasu MATSUO The University of Kitakyushu 1-1 Hibikino Wakamatsu-ku Kitakyushu Fukuoka 808-0135 Japan

This paper analyzes the behaviour of coating particles as well as the gas flow both inside and outside of the High-Velocity Oxy-Fuel （HVOF） thermal spray gun by using a quasi-one-dimensional analysis and a numerical simulation. The HVOF gun in the present analysis is an axially symmetric convergent-divergent nozzle with the design Math number of 2.0. From the present analysis, the distributions of veloeity and temperature of the coating particles flying inside and outside of the HVOF gun are predicted. The velocity and temperature of the coating particles at the exit of the gun calculated by the present method agree well with the previous experimental results. Therefore, the present method of calculation is considered to be useful for predicting the HVOF gas and particle flows.

关键词： compressible flow supersonic jet thermal spray HVOF.

Control strategy and methods for continuous direct compression processes

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Asian Journal of Pharmaceutical Sciences 2021年第2期16卷 253-262页

作者： Yasuhiro Suzuki Hirokazu sugiyama Manabu Kano Ryutaro Shimono Gosuke Shimada Ryoichi Furukawa Eichi Mano Keiichi Motoyama Tatsuo Koide Yasuhiro Matsui Kazuki Kurasaki Issei Takayama Shunin Hikage Noriko Katori Masahiko Kikuchi hiroshi Sakai Yoshihiro Matsuda Formulation Technology Research Laboratories Daiichi Sankyo Co.Ltd.Kanagawa 254-0014Japan Department of Chemical System Engineering The University of TokyoTokyo 113-8656Japan Department of Systems Science Kyoto UniversityKyoto 606-8501Japan CMC Sciences Department Regulatory Affairs DivisionR&D DivisionJanssen Pharmaceutical K.K.Tokyo 101-0065Japan EuroTechno Ltd. Kanagawa 223-0057Japan Pharmaceutical Research Department Mitsubishi Tanabe Pharma CorporationOsaka 532-8505Japan Chemical Products CMC Regulatory Affairs Area Japan DevelopmentMSD K.K.Tokyo 102-8667Japan Graduate School of Pharmaceutical Sciences Kumamoto UniversityKumamoto 862-0973Japan Division of Drugs National Institute of Health SciencesKawasaki 210-9501Japan Technology Research&Development Sumitomo Dainippon Pharma Co.Ltd.Osaka 564-0053Japan Formulation Development Department Chugai pharmaceutical Co.Ltd.Tokyo 115-8543Japan Office of New Drug IV Pharmaceuticals and Medical Devices AgencyShin-Kasumigaseki Bldg.Tokyo 100-0013Japan Office of Generic Drugs Pharmaceuticals and Medical Devices AgencyShin-Kasumigaseki Bldg.Tokyo 100-0013Japan KOKANDO Co. Ltd.Toyama 930-8580Japan Pharmaceuticals and Medical Devices Agency Shin-Kasumigaseki Bldg.Tokyo 100-0013Japan

We presented a control strategy for tablet manufacturing processes based on continuous direct *** work was conducted by the experts of pharmaceutical companies,machine suppliers,academia,and regulatory authority in *** different items in the process,the component ratio and blended powder content were selected as the items requiring the control method specific to continuous manufacturing different from the conventional batch *** control and management of the Loss in Weight(LIW)feeder were deemed the most important,and the Residence Time Distribution(RTD)model were regarded effective for setting the control range and for controlling of the LIW *** on these ideas,the concept of process control using RTD was summarized.

关键词： Continuous manufacturing Solid drug products Process control Residence time distribution Loss in weight feeder Regulatory science

Analysis of Particle Behavior in High-Velocity Oxy-Fuel Thermal Spraying Process

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Journal of Thermal Science 2003年第3期12卷 279-282页

作者： hiroshi Katanoda Kazuyasu Matsuo Department of Mechanical Systems and Environmental Engineering Faculty of Environmental EngineeringThe University of Kitakyushu1-1 HibikinoWakamatu-kuKitakyushuFukuoka808-0135JapanDepartment of Mechanical Systems and Environmental EngineeringFaculty of Environmental EngineeringThe University of Kitakyushu1-1 HibikinoWakamatu-kuKitakyushuFukuoka808-0135Japan

This paper analyzes the behavior of coating particle as Well as the gas flow both of inside and outside the High-Velocity Oxy-Fuel (HVOF) thermal spraying gun by using quasi-one-dimensional analysis and numerical simulation. The HVOF gun in the present analysis is an axisymmetric convergent-divergent nozzle with the design Mach number of 2.0 followed by a straight passage called barrel. In the present analysis it is assumed that the influence of the particles injected in the gas flow is neglected, and the interaction between the particles is also neglected. The gas flow in the gun is assumed to be quasi-one-dimensional adiabatic flow. The velocity, temperature and density of gas in the jet discharged from the barrel exit are predicted by solving Navier-Stokes equations numerically. The particle equation of motion is numerically integrated using three-step Runge-Kutta method. The drag coefficient of the particle is calculated by linear interpolation of the experimental data obtained in the past. Particle mean temperature is calculated by using Ranz and Marchalls' correlation for spherical particles. From the present analysis, the distributions of velocity and temperature of the coating particles flying inside and outside the HVOF gun are predicted.

关键词： supersonic nozzle supersonic jet thermal spraying gas-particle flow.

Parallel-core-type polarization rotator for silicon wire waveguide platform

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Photonics Research 2014年第3期2卷 S0014-S0018页

作者： hiroshi Fukuda Kazumi Wada The University of Tokyo School of Material Engineering7-3-1 HongoChiyodaTokyoJapan NTT Microsystem Integration LaboratoriesMorinosato-WakamiyaAtsugiKanagawaJapan

We describe a polarization rotator based on a parallel-core structure consisting of a silicon nanowire waveguide and a silicon-nitride *** 60-μm-long rotator provides a polarization extinction ratio of more than 10 dB with excess loss of less than 1 *** addition,the extremely wide bandwidth of more than 150 nm expected from calculations is confirmed in experiments.A study of the fabrication tolerance of our rotator indicates that fabrication error of around 25 nm is allowable.

关键词： polarization extinction fir

Homogeneity tests on neutron shield concrete

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Nuclear Science and Techniques 2014年第A1期25卷 57-61页

作者： Koichi Okuno hiroshi Iikura HAZAMA ANDO Technical Research Institute 515-1 Karima Tsukuba Ibaraki 305-0822 Japan JAEA Quantum Beam Science Directorate 2-4 Shirakata Tokai-mura Naka-gun Ibaraki 319-1195 Japan

In recent years, neutrons have been studied for application in fields such as material analysis and boron neutron capture therapy. To create a compact shield for these facilities, a neutron shield concrete is developed. Verifying the homogeneity of the concrete is important to ensure adequate shielding performance. In this research, neutron radiography images of the concrete are taken using the Thermal Neutron Radiography Facility (TNRF) of the JRR-3 research reactor, and the transmission ratio of the thermal neutrons were estimated. The results showed that the transmission ratio of the concrete was almost the same at each depth. © 2014, Science Press. All rights reserved.

关键词：中子屏蔽同质性测试研究反应堆中子俘获屏蔽性能照相设备中子照相

Promoting functional recovery by inhibition of repulsive guidance molecule-a after spinal cord injury

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Neural Regeneration Research 2018年第6期13卷 981-982页

作者： hiroshi Nakagawa Masahiko Takada Sobell Department of Motor Neuroscience and Movement Disorders Institute of Neurology University College London Systems Neuroscience Section Primate Research Institute Kyoto University

Spinal cord injury（SCI）leads to permanent disability with motor and sensory *** mature mammalian central nervous system（CNS）possesses a limited capacity to regenerate/regrow after injury.

关键词： Promoting functional recovery by inhibition of repulsive guidance molecule-a after spinal cord injury SCI

Surface finish of micro punch with ion beam irradiation

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 526-530页

作者： XU Jie WANG Chun-ju GUO Bin SHAN De-bin Y.sugiyama S.ONO School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Micro-Systems and Micro-Structures Manufacturing Ministry of EducationHarbin Institute of TechnologyHarbin 150080China Elionix Inc. Tokyo 192-0063Japan

Ion beam irradiation was adopted for surface treatment of the micro punch manufactured by precision *** plasma was used for the ion irradiation process,which was generated by the electron cyclotron resonance(ECR)*** surface finish processes of micro punch were carried out at irradiation angles of 45°and 10°,*** surface roughness and topography were measured to estimate the quality of surface *** results show that the ion irradiation is very effective to reduce the surface roughness,which can be improved more significantly at irradiation angle of 10°than at 45°.The technology of surface finish with ion beam irradiation is suitable for the surface treatment of micro die.

关键词： surface finish ion beam micro punch surface roughness

Conditions Where the Ruled Class Unites for the Revolution:Applicability of a Game Theory on Social Dilemmas

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学术界 2019年第6期 185-192页

作者： hiroshi Onishi Keio University

Revolutions,typical cases of crucial social transformations,cannot be realized successfully without a large number of ***,creating conditions favorable for acquiring enough participants should be an important topic of Marxist social *** particular,this problem includes the “free-ride,” because the benefits of revolutionaries’ activities are gained not only by the activists but also by all other *** paper analyzes problems such as this one,applying non-cooperative game theory to social dilemma *** leads to some interesting *** this research,the problem of the workers’ choice between unity or freeride is first defined using numerical examples of the gain *** is defined again in a more generalized form using other *** so doing,we express both the cost of participating in the movement and the gains from the concession of the ruling *** this analysis focuses on the importance of the number of participants,the concession of the ruling class is framed as a function of the number of *** results of this analysis revealed that the economic base and superstructure accurately correspond in some game structures but not in *** other words,the social dilemma presents either as a case of prisoners’ dilemma or as a chicken ***,this paper analyzes the influence of group size,and it was revealed that groups with a large number of members,such as a ruled class,find it particularly difficult to *** phenomenon is called the “large group dilemma.” In these ways,this research shows that the aforementioned type of game theory can be used to analyze the difficulties and possibilities of social movements.

关键词： revolution historical materialism social dilemma large group chicken game

BO_(2)-F^(+)Centers in the Radiation-damaged YCOB Crystals

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Chinese Physics Letters 2000年第12期17卷 896-898页

作者： RUAN Yong-Feng hiroshi NAKAO Takatomo SASAKI Department of Physics Tianjin UniversityTianjin 300072 Department of Electrical Engineering Osaka UniversityOsaka 565-0871Japan

An intense paramagnetic EPR signal generated from x-ray-irradiated,powdered YCOB crystals was observed at the liquid nitrogen temperature for the first *** peaks,located at the positions where the effective g factor equals to 1.992,1.986,1.980,1.974 and 1.965,labeled as A,B,C,D and E respectively,were *** is believed that the peaks A,B,C and D generated from the BO_(2)-F^(+)center which is a single electron trapped in an oxygen vacancy which was originally occupied by an O^(2-)ion bonded to a(BO3)^(3-)anion *** peak E is thought of coming from Y2+ions that are formed by the Y^(3+) ions trapping *** mechanism for the formation of the radiation-induced defects in the YCOB crystals is suggested.

关键词： Crystal occupied trapping