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High-quality micro-shape fabrication of monocrystalline diamond by nanosecond pulsed laser and acid cleaning

International Journal of Extreme Manufacturing 2022年第2期4卷 173-183页

作者： Yasuhiro Okamoto Tubasa Okubo atsuya kajitani Akira Okada Graduate School of Natural Science and Technology Okayama UniversityOkayamaJapan

The flat plane of small surface roughness below 0.1μm average roughness was obtained for monocrystalline diamond by nanosecond pulsed laser irradiation of 1060 nm and post-process acid cleaning,at a laser fluence around the material removal threshold *** glossy and flat plane at the bottom of the micro-groove was parallel to the top surface of the specimen,although the round beam of Gaussian mode was irradiated in the direction perpendicular to the top surface of *** square beam of top-hat mode produced a shallower micro-groove with a wider,flatter bottom compared with the round beam in Gaussian *** creation method of the flat plane with small surface roughness was discussed in the arrangement strategy of linear micro-grooving by the square beam of top-hat *** side-by-side repetition of linear micro-grooving did not create a flat plane with constant ***,a two-step scanning method was proposed in order to overcome the problem in the normal side-by-side repetition of liner ***-removal areas were partly retained between the processing lines in the first step,and the laser scanning was conducted on the retained area in the second *** newly proposed two-step scanning method was practical and useful to create a widely flat plane with small surface roughness,and the two-step scanning method provided superior control over the micro-groove *** proposed method can reduce the surface roughness in addition to the shape creation of monocrystalline diamond,and it can be used as a high-quality micro-shape fabrication method of monocrystalline diamond.

关键词： monocrystalline diamond nanosecond pulsed laser flat surface smooth surface micro-grooving

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The 2011 Eastern Japan Great Earthquake Disaster:Overview and Comments

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International Journal of Disaster Risk Science 2011年第1期2卷 34-42页

作者： Okada Norio Tao Ye Yoshio kajitani Peijun Shi Hirokazu Tatano Disaster Prevention Research Institute Kyoto UniversityKyoto 611-011Japan State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

This article briefly reviews the causes and impacts of the massive eastern Japan earthquake and tsunami of 11 March 2011, and comments on the response measures taken by Japan to cope with this devastating disaster. Mass losses occurred mostly because the intensity of the quake and the induced tsunami exceeded local coping capacity. Particularly, the nuclear power plant crisis triggered by the tsunami significantly increased the short-and long-term impacts of the disaster. While the coping capacity Japanese society built after the 1995 Hanshin-Awaji great earthquake tremendously mitigated the damages, there is room for improvement despite Japan’s great efforts in this disaster. Investigating the tsunami preparedness of the coastal nuclear power plants is an issue of paramount importance. In response to future large-scale disasters, there is an urgent need for a highly collaborative framework based on which all available resources could be mobilized;a mutual assistance and rescue system against catastrophes among regions and countries on the basis of international humanitarian aid;and further in-depth research on the multi-hazard and disaster-chain phenomenon in large-scale disasters and corresponding governance approaches.

关键词： disaster earthquake Eastern

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Experiment and Large-Eddy Simulation on Free Air Jets Issuing from a Rectangular Nozzle with Deflectors

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Journal of Flow Control, Measurement & Visualization 2021年第4期9卷 73-92页

作者： Riku Ouchi Takahiro Kiwata Naoki kajitani Hiroshi Teramoto Graduate School of Natural Science and Technology Kanazawa University Ishikawa Japan Thermal Management Systems R&D Div. DENSO CORP Aichi Japan School of Mechanical Engineering Kanazawa University Ishikawa Japan Department of Mechanical Engineering National Institute of Technology Ishikawa College Ishikawa Japan

The purpose of the present study was to establish a passive flow control method for a rectangular jet using two types of deflectors installed symmetrically inside a nozzle. This deflector in a rectangular nozzle generates the rectangular coaxial jets. The effect of the slant angle of the deflectors on the flow characteristics and the spread of the rectangular jet was investigated experimentally and by large-eddy simulation. The experiment and the numerical simulation were carried out at a Reynolds number of 9000. The rectangular jet with no deflectors generates a vortex ring from the nozzle exit. The vortex ring collapses in the downstream region and the outline of the jet changes from rectangular to diamond-shaped as a result of the axis-switching phenomenon. The rectangular jet with divergent and convergent deflectors shows particularly noticeable changes in the flow characteristics and vortical structures, as compared to the case with no deflectors. In the case of the rectangular jet with divergent deflectors (slant angle of α = 6°), minor axis spread is promoted more than major axis spread, and axis switching occurs closer to the nozzle exit than that in the case of no deflectors. The outline of the jet also changes from lateral rectangular to vertical rectangular as a result of axis switching. On the other hand, in the case of a rectangular jet with convergent deflectors (α = -6°), minor axis spread is suppressed more than major axis spread, and axis switching occurs farther from the nozzle exit than that in the case with no deflectors. The outline of the jet does not change until the downstre

关键词： Jet Rectangular Nozzle Deflectors Flow Control Flow Measurement Numerical Simulation LES

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角编码器的自动校准系统

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宇航计测技术 1991年第2期10卷 46-53页

作者： T.Masuda M.kajitani 刘乃谦

校准角编码器(或回转编码器)通常使用人工方法与机械参考标准(如精密分度台或多角镜)进行比较。用这种普通方法校准编码器的所有分度是一项很困难的工作,需要熟练的技巧且消耗大量的时间。本文介绍一种适用于各种数字角编码器并具有高... 详细信息

校准角编码器(或回转编码器)通常使用人工方法与机械参考标准(如精密分度台或多角镜)进行比较。用这种普通方法校准编码器的所有分度是一项很困难的工作,需要熟练的技巧且消耗大量的时间。本文介绍一种适用于各种数字角编码器并具有高精度和高效率的自动校准系统。校准圆周度盘和角编码器的基本方法可分两种:a.

关键词：角编码器自动校准系统

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Modulation of HPV-infected Cell Proliferation and Invasion by Ras Protein

Modulation of HPV-infected Cell Proliferation and Invasion b...

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24th International Papillomavirus Conference and Clinical Workshop

作者： Satoshi Yoshida Naoko kajitani Ayano Satsuka Hiroyasu Nakamura Hiroyuki Sakai Institute for Virus Reseach Kyoto University Institute for Virus Reseach Kyoto University Institute for Virus Reseach Kyoto University Institute for Virus Reseach Kyoto University Institute for Virus Reseach Kyoto University

＜正＞HPVs are associated with more than 90% of all human cervical *** two viral proteins,E6 and E7,which binds to and degrades p53 and pRb respectively,are considered as main factors of the HPV-induced tumorigenesis .However,it is understood that HPV infection alone is not sufficient for cancer formation Cervical carcinogenesis is considered as the multi-

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齿轮接触斑点自动检查

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中国检验检测 1985年第6期 9-12页

作者： Makoto kajitani 唐启昌

一、前言在加工过程中要用高级的测量设备来检查齿轮。特别是在自动加工工业中,齿轮的质量控制是十分重要的,这不仅为了保证高的性能,而且是为了在加工过程中进行监控。齿轮啮合中的承载条件与他们性能有着密切的关系,例如寿命、振动、... 详细信息

一、前言在加工过程中要用高级的测量设备来检查齿轮。特别是在自动加工工业中,齿轮的质量控制是十分重要的,这不仅为了保证高的性能,而且是为了在加工过程中进行监控。齿轮啮合中的承载条件与他们性能有着密切的关系,例如寿命、振动、嗓声等。因此,

关键词：齿轮接触斑点轮齿

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