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Vibration Response Characteristics against the Radial and Axial Shocks on Small Size Hard Disk Drive Spindle Supported by Oil Film Bearings

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Journal of Mechanics Engineering and Automation 2014年第7期4卷 547-554页

作者： masayuki ochiai Yuta Sunami Hiromu Hashimoto Department of Mechanical Engineering Tokai University Kanagawa 259-1292 Japan

This paper describes the experimental study on shock response of FDB （fluid dynamic bearing） spindle for HDDs （hard disk drives）. The FDBs are widely used as rotating shaft support elements for HDD spindle motors. Recently, the opportunity for the HDD spindle motors exposed to external vibration has been increasing because the HDDs are used for various information related equipment such as mobile PCs （personal computers）, video cameras, car navigation systems and so on. Hence, the rotating shaft has a possibility to come in contact with the bearing by external shocks and it causes wear or seizure to the bearing surface. To avoid the problem, it is extremely important to know how the spindle moves against the large shock on HDDs experimentally. However, as far as the authors know, there are few experimental studies treating the shock response of HDD spindles. In this paper, firstly, we propose a new test rig and experimental method for shock response of FDB spindles. Then the shock tests against the radial and axial disturbance on FDB spindle for 2.5＂ HDD are conducted. Finally, the experimental results of shock response waveforms and maximum displacement of disk are shown.

关键词： Tribology fluid film bearing hard disk drive spindle motor shock test shock response

Identification Method of Dynamic Coefficients of Fluid Film Bearings for HDD Spindle Motors

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Journal of Mechanics Engineering and Automation 2014年第2期4卷 123-129页

作者： masayuki ochiai Yuta Sunami Hiromu Hashimoto Department of Mechanical Engineering Tokai University Hiratsuka 259-1292 Japan

Fluid film bearings are widely used as support elements of rotating shaft for HDD （hard disk drive） spindle motors. Recently, the opportunity for the HDD spindle motors exposed to external vibration has been increasing because the HDDs are used for various information related equipments such as mobile PCs, car navigation systems. Hence, the rotating shaft has a possibility to come in contact with the bearing and it causes wear or seizure to the bearing surface. In order to avoid the problems, it is extremely important to enhance the dynamic characteristics of the fluid film bearings for spindles. However, verification from both theory and experiment of dynamic characteristics such as spring coefficients and damping coefficients is rare and few. In this paper, the bearing vibration characteristics when the HDD spindle is oscillated are investigated theoretically and experimentally. And then the identification method ofoil film coefficients of fluid film bearing spindles is described.

关键词： Tribology fluid film bearing hard disk drive spindle motor dynamic coefficient vibration identification.

自然印记日本Strata/Springscape美容院

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室内设计与装修 2024年第5期 148-149页

作者： Moriyuki ochiai Architects Moriyuki ochiai Architects 日本

在这个项目中,美容院不仅是一个提供美容服务的场所,还是一个沉浸式的自然体验场所。顾客步入店内,仿佛走进了一个由大自然精心雕琢的艺术空间。设计师将地层、土壤、泉水和溪流等元素融入内部装饰之中,创造了一个独一无二的环境。这些... 详细信息

在这个项目中,美容院不仅是一个提供美容服务的场所,还是一个沉浸式的自然体验场所。顾客步入店内,仿佛走进了一个由大自然精心雕琢的艺术空间。设计师将地层、土壤、泉水和溪流等元素融入内部装饰之中,创造了一个独一无二的环境。这些自然元素的使用不仅是为了美观,它们也在传达一种与大自然和谐共存的理念。室内的每一处细节,都可以感受到自然的呼吸和生命力。例如,地板上的纹理仿佛诉说着地层的历史,墙面上的蓝色渐变则如同清澈的泉水在石间流淌。这样的设计,让人们在享受美容服务的同时,也能体验到城市喧嚣中难得一见的宁静和平和。

关键词：内部装饰自然元素沉浸式美容服务美容院自然体验和谐共存

Successful Cord Blood Transplantation for a CHARGE Syndrome with CHD7 Mutation Showing Characteristic Triad of DiGeorge Syndrome Including Hypoparathyroidism

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Successful Cord Blood Transplantation for a CHARGE Syndrome ...

Pyridine-Fused Azacorannulene:Fine-Tuning of the Structure and Properties of Nitrogen-Embedded Buckybowls

第五届亚洲儿科研究大会

作者： Hidetoshi Takada Hirosuke Inoue Masataka Ishimura Takeshi Kusuda Takako Goto masayuki ochiai Tadamune Kinjo Jun Muneuchi Yasushi Takahata Kenjiro Kosaki Toshiro Hara Department of Pediatrics Graduate School of Medical SciencesKyushu University

＜正＞Charge syndrome is a distinctive syndrome of multiple congenital anomalies including coloboma,congenital heart defects,choanal atresia,retarding of growth,developmental delay,genital abnormalities,ear anomalies,...

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Precision Chemistry 2023年第1期1卷 29-33页

作者： Kimihiro Nakamura Kotaro ochiai Ayaka Yubuta Dan He Daigo Miyajima Shingo Ito School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological UniversitySingapore 637371 Center for Emergent Matter Science RIKENWakoSaitama 351-0198Japan College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Heteroatom-embedded buckybowl molecules provide a fundamental molecular framework that has potential applications in various research ***,selective introduction of heteroatoms into buckybowls is challenging,and thus,studies investigating the effect of introduced heteroatoms have been ***,we report the synthesis of pyridine-fused azacorannulene *** influence of nitrogen atoms introduced into the peripheral positions on the structural,electronic,and optical properties is discussed.

关键词： Azacorannulene Buckybowl Polycyclic Aromatic Molecule 1 3-Dipolar Cycloaddition Azomethine Ylide

An experimental investigation of transient cavitation control on a hydrofoil using hemispherical vortex generators

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Journal of Hydrodynamics 2021年第6期33卷 1139-1147页

作者： Ebrahim Kadivar Takaho ochiai Yuka Iga Ould el Moctar Ship Technology Ocean Engineering and Transport SystemsUniversity of Duisburg-EssenDuisburgGermany Institute of Fluid Scienece Tohoku UniversitySendaiJapan

Unsteady cavitation causes noise,damage,and performance decline in the marine engineering and fluid machinery ***,finding a method to control the cavitation and its destructive effects is important for the industrial *** this work,we proposed a passive method to control the unsteady behavior of transient cavitation at the medium Reynolds *** this aim,we performed an experimental study using a high-speed camera to analyze the effects of hemispherical vortex generators(VGs)on the cavitation dynamics around a hydrofoil *** addition,the pressure pulsations induced by the collapse of the cavity structures in the wake region of the hydrofoil were captured with a pressure transducer mounted on the wall downstream of the *** results showed that the instability behaviors of the cavity structures on the hydrofoil were mitigated using the proposed cavitation passive control *** addition,the pressure pulsations in the wake region of the hydrofoil were reduced *** can be concluded that the suppression of cavitation instabilities can improve the operating life and reliability of the marine and hydraulic systems.

关键词： Hydrodynamic cavitation cavitation passive control hemispherical vortex generators pressure pulsations high speed observation

Analytical solution for the size of the minimum dominating set in complex networks

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第1期8卷 67-82页

作者： Jose C.Nacher Tomoshiro ochiai Department of Information Science Faculty of Science Toho UniversityMiyama 2-2-1 FunabashiChiba 274-8510Japan Faculty of Social Information Studies Otsuma Women’s University 2-7-1 Karakida Tama-shiTokyo 206-8540Japan

Domination is the fastest-growing field within graph theory with a profound diversity and impact in real-world applications,such as the recent breakthrough approach that identifies optimized subsets of proteins enriched with cancer-related *** its conceptual simplicity,domination is a classical NP-complete decision problem which makes analytical solutions elusive and poses difficulties to design optimization algorithms for finding a dominating set of minimum cardinality in a large ***,we derive for the first time an approximate analytical solution for the density of the minimum dominating set(MDS)by using a combination of cavity method and ultra-discretization(UD)*** derived equation allows us to compute the size of MDS by only using as an input the information of the degree distribution of a given network.

关键词： Minimum dominating set analytical solution statistical methods complex networks

Laparoscopic cholecystectomy for gangrenous cholecystitis in around nineties: Two case reports

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World Journal of Clinical Cases 2021年第14期9卷 3424-3431页

作者： Hiroyuki Inoue Toshiya ochiai Hidemasa Kubo Yusuke Yamamoto Ryo Morimura Hisashi Ikoma Eigo Otsuji Division of Digestive Surgery Department of SurgeryKyoto Prefectual University of MedicineKyoto 6028566Japan Department of Surgery North Medical Center Kyoto Prefectural University of MedicineKyoto 6292261Japan Division of Digestive Surgery Department of SurgeryKyoto Prefectural University of MedicineKyoto 6028566Japan

BACKGROUND Gangrenous cholecystitis is a form of acute cholecystitis which involves gangrenous alterations in the gallbladder wall and it often follows an acute and serious *** herein report on two cases of very elderly people diagnosed early with gangrenous cholecystitis,who safely underwent laparoscopic cholecystectomy(LC)and both demonstrated a good *** SUMMARY Case 1:An 89-year-old *** underwent abdominal contrast-enhanced computed tomography(CECT)due to abdominal pain and *** gallbladder wall indicated the absence of contrast enhancement,thus leading to diagnosis of gangrenous cholecystitis and she therefore underwent *** her gallbladder demonstrated diffuse necrosis and it was also partly perforated,she was able to be discharged without any serious *** 2:A 91-year-old *** made an emergency visit with a chief complaint of abdominal *** CECT revealed swelling of the gallbladder and an ambiguous continuity of the gallbladder *** was diagnosed with gangrenous cholecystitis and underwent *** gallbladder had swelling and diffuse *** her preoperative blood culture was positive,she showed a good outcome following *** Although a definite diagnosis of gangrenous cholecystitis is difficult to make prior to surgery,if an early diagnosis can be made and appropriate treatment can be carried out,then even very elderly individuals may be discharged without major complications.

关键词： Gangrenous cholecystitis Laparoscopic cholecystectomy Elderly people Critical view of safety Tokyo guidelines 2018 Case report

Purcell effect of GaAs quantum dots by photonic crystal microcavities

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Chinese Optics Letters 2009年第10期7卷 879-881页

作者： Kazuaki Sakoda Takashi Kuroda NaokiI keda Takaaki Mano Yoshimasa Sugimoto Tetsuyuki ochiai Keiji Kuroda Shunsuke Ohkouchi Nobuyuki Koguchi Kiyoshi Asakawa National Institute for Materials Science Japan Graduate School of Pure and Applied Sciences University of Tsukuba NEC Corporation

We fabricate photonic crystal slab microcavities embedded with GaAs quantum dots by electron beam lithography and droplet epitaxy. The Purcell effect of exciton emission of the quantum dots is confirmed by the micro photoluminescence measurement. The resonance wavelengths, widths, and polarization are consistent with numerical simulation results.

关键词： GaAs Purcell effect of GaAs quantum dots by photonic crystal microcavities QDs