检索结果-南通市图书馆

Biosurface and Biotribology 2019年第1期5卷 1-7页

作者： Nana Motojima yuta Nakashima Yukio Fujiwara Yoshihiro Komohara Motohiro Takeya Hiromasa Miura Kazunori Hino Hidehiko Higaki Hidehiro Hata Yoshitaka Nakanishi Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiCyuo-kuKumamoto 860-8555Japan Faculty of Advanced Science and Technology Kumamoto UniversityKumamotoJapan Faculty of Life Science and Technology Kumamoto UniversityKumamotoJapan Graduate School of Medicine Ehime UniversityEhimeJapan Faculty of Life Science Kyushu Sangyo UniversityFukuokaJapan

The relationship between the wear behaviour of an ultra-high-molecular-weight polyethylene(GUR1050)pin and surface profile of a Co-28Cr-6Mo alloy(ASTM F-75)disc was *** tests have been performed by pin-on-disc wear testing machine with multi-directional pathways,obtaining the influence of micro slurry-jet erosion(MSE)processed Co–Cr–Mo *** specific wear and the wear particles have been *** was elucidated that the Co–Cr–Mo alloy surface processed by MSE influenced the specific wear rate of polyethylene;however,the morphological aspect of polyethylene wear particles was not drastically *** wear particles isolated from the lubricating liquid were added to a culture medium,and human monocyte-derived macrophages were incubated by using an upright/inverted *** production of TNF-α and IL-6 seemed to have a correlation with the amount of wear particles added,however,the influence of particle size on the production of TNF-α and IL-6 was not *** means that the improvements for the incubation method,***/inverted method,need further investigation for the accurate analysis.

关键词： wear alloy behaviour

Single and multiple optical switches that use freestanding silicon nanowire waveguide couplers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2012年第1期1卷 92-99页

作者： yuta Akihama Kazuhiro Hane Department of Nanomechanics Tohoku UniversitySendai 980-0952Japan

Silicon photonic devices consisting of nanowire waveguides are a promising technology for on-chip integration in future optical telecommunication and interconnection systems based on silicon-large scale integration ***,the accommodation of variable optical components on a chip remains challenging due to the small size of *** this study,we investigated the characteristics of a microelectromechanical silicon nanowire waveguide switch with a gap-variable *** to its capacitive operation,the proposed waveguide switch consumed negligible power relative to switches that use a thermo-optical effect and carrier *** proposed switch was characterized using analyses based on coupled-mode theory for rectangular waveguides,as well as a simulation using the finite difference time domain method.A 2×2 single switch with an improved configuration and a 2×6 multiple switch composed of the 2×2 switches was designed and fabricated by a combination of electron beam lithography,fast-atom beam etching and hydrofluoric acid vapor sacrificial *** properties of the switches were measured and evaluated at a wavelength of 1.55 μm.

关键词： microelectromechanical systems optical switch silicon photonics

Decreased incidence followed by comeback of pediatric infections during the COVID‑19 pandemic in Japan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2022年第8期18卷 564-567页

作者： Cyrus Ghaznavi Haruka Sakamoto Takayuki Kawashima Sayaka Horiuchi Masahiro Ishikane Sarah Krull Abe Daisuke Yoneoka Akifumi Eguchi yuta Tanoue Masahiro Hashizume Shuhei Nomura Department of Health Policy and Management School of MedicineKeio University35 ShinanomachiShinjuku-kuTokyo 160-8582Japan Medical Education Program Washington University School of Medicine in St.LouisSaint LouisUSA Department of Global Health Policy Graduate School of MedicineThe University of TokyoTokyoJapan Tokyo Foundation for Policy Research TokyoJapan Department of Hygiene and Public Health Tokyo Women’s Medical UniversityTokyoJapan Department of Mathematical and Computing Science Tokyo Institute of TechnologyTokyoJapan Center for Birth Cohort Studies University of YamanashiYamanashiJapan Disease Control and Prevention Center National Center for Global Health and MedicineTokyoJapan Division of Prevention National Cancer Center Institute for Cancer ControlTokyoJapan Infectious Disease Surveillance Center National Institute of Infectious DiseasesTokyoJapan Department of Sustainable Health Science Center for Preventive Medical SciencesChiba UniversityChibaJapan Institute for Business and Finance Waseda UniversityTokyoJapan

During the coronavirus disease 2019(COVID-19)pandemic,the Japanese government implemented several infection control measures,such as states of emergency(SoE)and school closures,and encouraged universal masking and hand *** activity restrictions and improved hygiene were found to be associated with declines in the incidence of infuenza during the 2019–2020 winter season[1].Prior studies have found that the incidence of seven pediatric infections,such as pharyngoconjunctivitis and varicella,decreased during and after the school closures in Japan[2].As activity restrictions continue to be lifted,there is growing concern that pediatric infections may suddenly return given that the pool of susceptible children increased during the pandemic[3].In this study,we use national infectious disease sentinel data from January 2012 to October 2021 to assess changes in the reported number of pediatric infections in Japan during the COVID-19 *** hypothesize that the reporting of many infectious diseases decreased during the early stages of the pandemic but ultimately returned to normal when activity restrictions were lifted.

关键词： closure return suddenly

Wettability Control between Oleophobic/Superhydrophilic and Superoleophilic/Superhydrophobic Characteristics on the Modified Surface Treated with Fluoroalkyl End-Capped Oligomers/Micro-Sized Polystyrene Particle Composites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Composite Materials 2022年第1期12卷 41-55页

作者： Hideo Sawada Koki Arakawa yuta Aomi Department of Frontier Materials Chemistry Graduate School of Science and Technology Hirosaki University Hirosaki Japan

Fluoroalkyl end-capped vinyltrimethoxysilane-N,N-dimethylacrylamide cooligomer [RF-(CH2-CHSi(OMe)3)x-(CH2-CHC(=O)NMe2)y-RF;RF = CF(CF3)OC3F7: RF-(VM)x-(DMAA)y-R

关键词： Fluorinated Oligomeric Composite Micro-Sized Polystyrene Particle Surface Modification Surface Wettability Change Oleophobic/Superhydrophilic Property Superoleophilic/Superhydrophobic Property

High Speed Observation of Periodic Cavity Behavior in a Convergent-Divergent Nozzle for Cavitating Water Jet

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Flow Control, Measurement & Visualization 2013年第3期1卷 102-107页

作者： Keiichi Sato yuta Taguchi Shota Hayashi Department of Mechanical Engineering Kanazawa Institute of Technology Nonoichi Japan

Cloud cavitation shows an unsteady periodic tendency under a certain flow condition. In a cavitating water jet flow with cavitation clouds, the cavities or the clouds produce high impact at their collapse. In order to make clear a mechanism of the periodic cavity behavior, we experimentally examine the behavior in a transparent cylindrical convergent-divergent nozzle using a high-speed video camera. An effect of upstream pressure fluctuation due to a plunger pump is investigated from a viewpoint of unsteady behavior in a cavitating water jet. As a result, it is found that the cavitating flow has two kinds of oscillation patterns in the cavity length (cavitation cloud region). One is due to the upstream pressure fluctuation caused by the plunger pump. The other is much shorter periodic motion related to the characteristic oscillation of cavitation clouds accompanied with the shrinking (reentrant), growing and shedding motion of the clouds.

关键词： Cloud Cavitation Periodic Behavior Water Jet High-Speed Video Observation Image Analysis

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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.

Intelligent Wind Power Unit with Tandem Wind Rotors and Armatures （Optimization of Front Blade Profile）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2012年第11期6卷 1791-1799页

作者： yuta Usui Koichi Kubo Toshiaki Kanemoto Graduate School of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan Kyushu Institute of Technology Kitakyushu 804-8550 Japan Faculty of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan

The authors have invented the superior wind power unit, which is composed of the tandem wind rotors and the double rotational armature type generator without the traditional stator. The large-sized front wind rotor and the small-sized rear wind rotor drive, as for the upwind type, the inner and the outer rotational armatures, respectively, in keeping the rotational torque counter-balanced between both wind rotors/armatures. The unique rotational behaviors of the tandem wind rotors and the fundamental performances of the unit have been discussed at the previous paper. Continuously, this paper investigates experimentally and numerically the flow condition around the wind rotors to know the flow interactions between the front and the rear wind rotors, and optimizes the blade profile in the front wind rotor. The front blade should work fruitfully at the larger radius and had better not work at the smaller radius for giving plenty of wind energy to the rear wind rotor, taking account of the flow interaction between both wind rotors.

关键词： Wind turbine wind energy blade tandem wind rotors generator armature numerical simulation.

Allergic reaction to anisakis-contaminated fish after the first administration of BNT162b2 mRNA vaccine:a case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gastroenterology Report 2022年第1期10卷 650-652页

作者： Fumiue Harada Kana Yamamoto Tomoki Matsuda Chika Yamamoto yuta Tani Mutsuko Ohnishi Morihito Takita Tetsuya Tanimoto Masahiro Kami Ryusaburo Shineha Department of Internal Medicine Soma Central HospitalSomaFukushimaJapan Department of Disaster and Comprehensive Medicine Fukushima Medical UniversityFukushimaFukushimaJapan Department of Radiation Health Management Fukushima Medical UniversityFukushimaFukushimaJapan Research Division Medical Governance Research InstituteMinatoTokyoJapan

Introduction SARS-CoV-2 vaccination is an effective means to prevent severe illness and death due to SARS-CoV-2 infection[1].Vaccine safety has been carefully monitored to be sure that the benefit outweighs the risk of adverse events(AEs).Common AEs of the BNT162b2 mRNA vaccine,for example,include fatigue(45%),headache(40%),and chills(28%)after the first administration in accordance with the adult phase Ⅲ clinical trial[1].

关键词： headache death administration