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钢的枝晶生长及相关现象的观测

钢的枝晶生长及相关现象的观测

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

作者： Hideyuki Yasuda Tomoya Nagira Masato Yoshiya akira sugiyama Kentaro Uesugi Keiji Umetani 大阪大学机械系统系大阪大学先进结构与功能材料设计中心大阪产业大学企业家策划系

用同步X射线可以对钢的凝固过程进行原位观测,铁硅合金和铁碳合金中的枝晶形成过程清晰可见。对于铁硅合金,液相中硅的浓度可以从试样中X射线的透射强度估计出来。对传统的O.45mass%C碳钢,可以观测从6相向γ相的转变过程。时间分辨图像... 详细信息

用同步X射线可以对钢的凝固过程进行原位观测,铁硅合金和铁碳合金中的枝晶形成过程清晰可见。对于铁硅合金,液相中硅的浓度可以从试样中X射线的透射强度估计出来。对传统的O.45mass%C碳钢,可以观测从6相向γ相的转变过程。时间分辨图像显示,这种转变与包晶的转变/反应大不相同。X射线成像技术有望成为理解高温下凝固现象的一种工具。

关键词：实时观测偏析现象晶粒选择同步辐射

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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.

共焦显微镜对活体Francois角膜营养不良中央混浊的观察

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美国医学会眼科杂志（中文版） 2005年第3期17卷 189-189页

作者： akira Kobayashi Kazuhisa sugiyama Andrew J. W. Huang 陆遥（译）

目的：报告用共焦显微镜观察活体Francois角膜营养不良中央混浊的结果。方法：2位不相关的患者，一位78岁男性和一位75岁女性。均患有Francois角膜营养不良伴中央混浊，用常规裂隙灯活体显微镜和共焦显微镜进行检查。

关键词：角膜营养不良共焦显微镜活体显微镜混浊中央微镜观察裂隙灯

Application of Mechanical Similarity Laws to the Collection Efficiencies of Geometrically Types of Uni-Flow Cyclone Dust Collectors

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Journal of Thermal Science 1993年第2期2卷 87-87页

作者： akira OGAWA Kazuya sugiyama Department of Mechanical Engineering College of Engineering Nihon University T-963. Tokusada Tamura-machi Kooriyama-shi Japan Professor Dr. Sanyo-Electric Co. Ltd T-570. Kyosaka Hondori 2-18 Moriguchi-shi Oosaka-hu Japan

From the mechanical similarity point of view, the centrifugal effect, Ar, and the Stokes number, St, as well as the Reynolds number, Re_c for the motion of solid particles in the cyclone are the relevant parameters. In order to apply these similarity laws for the prediction of the characteristics of the collection efficiency, ηc, geometrically similar types of uni-flow cyclones were used. The body diameters of the cyclones were D_1=30, 50, 69 and 99 mm, respectively. The feed particle concentration of the fly-ash particles was up to C_o = 60g/m^3. From the experimental results: (1) the pressure drop, △pc, in the cyclones was a function of not only the Reynods number, Re_c, but also the body diameter, D_1; (2) the collection efficiency, η_c, did not always increase with decreasing body diameter but there existed an optimal body size; (3) application of the mechanical similarity laws to the collection efficiency was not always sufficient for estimating the collection efficiency, since the feed particle concentration was an additional important factor; (4) a new parameter which was the ratio, E_(pf), of the apparent separation energy, W_p, of the solid particles to the energy loss, E_c, of the gas flow in the cyclone was introduced for discussing the collection efficiency; (5) Fuchs theory, used to estimate the collection efficiency, was examined. Fuchs theory may be applied for high feed particle concentration.

关键词： vortex flow turbulent diffusion turbulent mixing cyclone dust collector collection efficiency mechanical similarity law fuchs theory

Weyl points and Dirac lines protected by multiple screw rotations

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Science Bulletin 2017年第11期62卷 788-794页

作者： akira Furusaki Condensed Matter Theory Laboratory RIKEN Wako Saitama 351-0198 Japan

In three-dimensional noncentrosymmetric materials two-fold screw rotation symmetry forces electron＇s energy bands to have Weyl points at which two bands touch. This is illustrated for space groups No. 19 （P212121 ） and No. 198 （P213）, which have three orthogonal screw rotation axes. In the case of space groups No. 61 （Pbca） and No. 205 （Pa-3） that have extra inversion symmetry, Weyl points are promoted to four-fold degenerate line nodes in glide-invariant planes. The three-fold rotation symmetry present in the space groups No. 198 and No. 205 allows Weyl and Dirac points, respectively, to appear along its rotation axes in the Brillouin zone and generates four-fold and six-fold degeneracy at the F point and R point, respectively.

关键词： Weyl points Dirac points Nodal lines Nonsymmorphic symmetry

Reduced hemoglobin and increased C-reactive protein are associated with upper gastrointestinal bleeding

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World Journal of Gastroenterology 2014年第5期20卷 1311-1317页

作者： Minoru Tomizawa Fuminobu Shinozaki Rumiko Hasegawa akira Togawa Yoshinori Shirai Noboru Ichiki Yasufumi Motoyoshi Takao sugiyama Shigenori Yamamoto Makoto Sueishi Department of Gastroenterology National Hospital Organization Shimoshizu Hospital Yotsukaido City Department of Radiology National Hospital Organization Shimoshizu Hospital Yotsukaido City Department of Surgery National Hospital Organization Shimoshizu Hospital Yotsukaido City Department of Neurology National Hos- pital Organization Shimoshizu Hospital Yotsukaido City Department of Rheumatology National Hospital Organization Shimoshizu Hospital Yotsukaido City Department of Pediatrics National Hospital Organization Shimoshizu Hospital Yotsukaido City

AIM: To investigate the early upper gastrointestinal endoscopy (endoscopy) significantly reduces mortality resulting from upper gastrointestinal (GI) bleeding.

关键词： Receiver operating characteristic Area under curve Sensitivity Specificity Gastrointestinal bleeding

Estimations of the Maximum Tangential Velocity V_(θm) in the Vortex Core Region and also the Mean Rotational Velocity V_(oi) near the Concave Wall Surface in the Returned Flow Type Cyclone Dust Collector

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Journal of Thermal Science 2010年第6期19卷 553-560页

作者： akira Ogawa T 110-0011. Minowa 2-14-7 Taitou-Ku Tokyo Japan

There are many types of cyclone dust collectors for separating the fine solid and dust particles from gases in the various industries and also in the home used purposes. For estimating the power loss and the collection efficiency, one of the most important factors is the maximum tangential velocity V0m in the vortex core region in the cyclone body. In order to determine V0~ by the simple method, it is useful to apply the mechanical balance of the angular momentum fluxes under the assumption of Ogawa combined vortex model which is composed of the quasi-forced vortex in the vortex core region and also the quasi-free vortex surrounded the vortex core region and also under the assumption of the introduction of equivalent length Heq corresponding to the cone spaces of the cyclone body and the dust bunker. On the other hand, the mean rotational velocity Voi near the concave wall surface is also estimated by the mechanical balance of angular momentum fluxes with the moment of viscous friction force. For confirming the general applications of the obtained equations, the returned flow types cyclones changed the throat diameter D3 are designed. The material of the cyclone is the transparent acrylic resin. Therefore the inner surface of the cyclone body can be regarded as smooth surface. The comparisons of the measured velocities V~ and Voi by a cylindrical Pitot tube are shown in good agreement with those of the proposed equations. The above stated results are described in detail.

关键词： Cyclone Dust Collector Maximum Tangential Velocity Mean Rotational Velocity Angular Momentum Flux Equivalent Length Surface Frictional Force Ogawa Combined Vortex Model Reynolds Number.

Comparison of generalized engine control and MPC based on maximum principle

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Control Theory and Technology 2017年第2期15卷 150-157页

作者： akira OHATA TECHNOVA Inc. The Imperial Hotel Tower 1-1 Uchisaiwai-cho 1 Chiyoda-ku Tokyo 100-0011 Japan

Automotive engine control has been continuously improved due to the strong demands from the society and the market since introducing electronic controls but not always following control theories. Therefore, it is not easy for researchers from academia and even engineers from the automotive industry to grasp the whole aspect of engine control. To encounter the issue, important features of engine control are extracted and generalized from the standpoint of control engineering. Comparisons of the control and model predictive control （MPC） showed an outstanding performance of the control generalized from engine controls and how to apply MPC in the framework.

关键词： Automotive engine history of engine control control design input constraints time delay model predictive control

Control of Collection Efficiency for Axial Flow Cyclone Dust Collectors with Fixed Guide Vanes and with Funnel Shaped Exit Pipes

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Journal of Thermal Science 2006年第3期15卷 240-250页

作者： akira Ogawa Masaru Arakawa T-110-0011 Minowa 2-14-7Taitou-KuTokyoJapan SHINWA RULES Co. Ltd.Sanjo-ShiNiigataJapan

The experimental result of the collection efficiency of the axial flow cyclone with the fixed guide vanes is lower than that with the tangential inlet pipe to the cyclone body due to the weak angular momentum transfer given by flowing through the guide vanes. However, one of the interesting points is the control of the collection efficiency depended on the funnel shaped exit pipes. The collection efficiencies for these funnel shaped exit pipes are depended on the Froude number. Then, in this paper, the experimental results of the pressure drop and also the collection efficiency using the fly-ash particles and also the comparison of the calculated results of the collection efficiency with the experimental results are described i~ detail.

关键词： Axial flow cyclone funnel shaped exit pipe fixed guide vanes pressure drop collection efficiency,Froude number cut-Size