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Deterioration of Water Ballast Tank Coating Systems by Active Substances in Ballast Water Management Systems

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Journal of Shipping and Ocean Engineering 2014年第9期4卷 229-235页

作者： Ryuji Kojima michiaki ikai Toshiaki Shibata Koichi Ueda Department of Marine Environment and Engine Systems National Mazitime Research Institute Tokyo 1810004 Japan

Sodium hypochlorite and ozone are the principal active substances and usually employed in ballast water management systems. In the present study, the authors focus on the effect of these active substances to the maaix polymer of coating. In order to obtain such information, the authors investigated the penetration of active substances to the polymer from cross section of specimens introduced by SAICAS （surface and interracial cutting analysis system）, followed by FT-IR-ATR （Fourier transform infrared and attenuated total reflectance） spectroscopy analysis from Z direction of cross section. The corrosion test of coating panels by these active substances （control as artificial seawater） has been conducted for 120 days. The results show that the depth profile of each active substance is around few dozens of micrometers from coating surface. The criteria of corrosion test cannot be determined by these results due to lacking in actual corrosion data immersed for 15 years under active substances. However, the authors evaluated the effect on ballast tank coating systems by active substances using analytical methods of SAICAS and FT-IR-ATR spectroscopy.

关键词： Ozone sodium hypochlorite SAICAS FT-IR-ATR epoxy resin PSPC ballast water management systems.

Inherited multimodal microstructure evolution of high-fracture-toughness Mg-Zn-Y-Al alloys during extrusion for the consolidation of rapidly solidified ribbons

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Journal of Magnesium and Alloys 2022年第9期10卷 2433-2445页

作者： Soya Nishimoto michiaki Yamasaki Yoshihito Kawamura Department of Materials Science Graduate School of Science and TechnologyKumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan Magnesium Research Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan

The mechanisms of multimodal microstructure evolution and the effects of microstructural factors on mechanical properties must be elucidated to design new alloys with superior *** this study,high-fracture-toughness and ductile Mg_(96.75)Zn_(0.85)Y_(2.05)Al_(0.35) alloys were developed using rapidly solidified(RS)ribbon-consolidation technique,and the inherited multimodal microstructure evolution during plastic flow consolidation of the RS ribbons was *** use of extrusion for plastic flow consolidation of the heat-treated RS ribbons produced a multimodal microstructure consisting of the worked grains with high Kernel average misorientation(KAM)angles(Group1),the ultrafine dynamically recrystallized(DRXed)grains with intermediate KAM angles(Group 2),and the fine DRXed grains with low KAM angles(Group 3).Groups 1 and 2 contribute to the alloy strengthening,while Group 3 contributes to improving ductility with strainhardening,resulting in enhancement of the fracture *** form the multimodal microstructure,it was necessary to apply plastic flow with equivalent strains of>2.3 to the heat-treated RS ribbons possessing duplex microstructures with different dispersions of the long-period stacking ordered phase.

关键词： Magnesium alloy Long-period stacking ordered phase Multimodal microstructure Rapid solidification Extrusion Dynamic recrystallization

Effects of multimodal microstructure on fracture toughness and its anisotropy of LPSO-type extruded Mg-1Zn-2Y alloys

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Journal of Magnesium and Alloys 2024年第7期12卷 2952-2966页

作者： Soya Nishimoto Taiga Yasuda Koji Hagihara michiaki Yamasaki Department of Materials Science Graduate School of Science and TechnologyKumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan Magnesium Research Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan Department of Physical Science and Engineering Nagoya Institute of technologyGokiso-choShowa-kuNagoya 466-8555Japan

The fracture toughness of extruded Mg-1Zn-2Y(at.%)alloys,featuring a multimodal microstructure containing fine dynamically recrystallized(DRXed)grains with random crystallographic orientation and coarse-worked grains with a strong fiber texture,was *** DRXed grains comprised randomly oriented equiaxedα-Mg *** contrast,the worked grains includedα-Mg and long-period stacking ordered(LPSO)phases that extended in the extrusion direction(ED).Both types displayed a strong texture,aligning the(10.10)direction parallel to the *** volume fractions of the DRXed and worked grains were controlled by adjusting the extrusion *** the longitudinal-transverse(L-T)orientation,where the loading direction was aligned parallel to the ED,there was a tendency for the conditional fracture toughness,KQ,tended to increase as the volume fraction of the worked grains ***,the KQ values in the T-L orientation,where the loading direction was perpendicular to the ED,decreased with an increase in the volume fraction of the worked *** suggests strong anisotropy in the fracture toughness of the specimen with a high volume fraction of the worked grains,relative to the test *** worked grains,which included the LPSO phase and were elongated perpendicular to the initial crack plane,suppressed the straight crack extension,causing crack deflection,and generating secondary ***,these worked grains significantly contributed to the fracture toughness of the extruded Mg-1Zn-2Y alloys in the L-T orientation.

关键词： Magnesium alloy Magnesium-zinc-yttrium Long-period stacking ordered phase Multimodal microstructure Fracture toughness

A Straight-bladed Vertical Axis Wind Turbine with a Directed Guide Vane Row-Effect of Guide Vane Geometry on the Performance-

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Journal of Thermal Science 2009年第1期18卷 54-57页

作者： Manabu TAKAO Hideki KUMA Takao MAEDA Yasunari KAMADA michiaki OKI Atsushi MINODA Department of Mechanical Engineering Matsue National College of Technology Department of Mechanical Engineering Mie University

The objective of this study is to show the effect of guide vane geometry on the performance. In order to overcome the disadvantages of vertical axis wind turbine, a straight-bladed vertical axis wind turbine （S-VAWT） with a directed guide vane row has been proposed and tested by the authors. According to previous studies, it was clarified that the performance of the turbine can be improved by means of the directed guide vane row. However, the guide vane geometry of S-VAWT has not been optimized so far. In order to clarify the effect of guide vanegeometry, the effects of setting angle and gap between rotor blade and guide vane on power coefticlent and start- ing characteristic were investigated in the experiments. The experimental study of the proposed wind turbine was carried out by a wind tunnel. The wind tunnel with a diameter of 1.8m is open jet type. The wind velocity is 8 m/s in the experiments. The rotor has three straight blades with a profile of NACA0018 and a chord length of 100 mm, a diameter of 0.6 m and a blade height of 0.7 m. The guide vane row consists of 3 arc plates.

关键词： fluid machinery wind energy vertical axis wind turbine guide vane

PRODUCTION OF HIGH QUALITYLUBRICATING BASE OIL

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石油学报（石油加工） 2001年第1期17卷 77-80页

作者： Hajime OKAZAKI michiaki ADACHI Jin-ichi IGARASHI Central Technical Research Laboratory Nippon Mitsubishi Oil Corporation8 Chidori-cho Naka-ku YokohamaKanagawa 231-0815

High VI lubricating oil is produced in hydrocracker through hydrocracking (HDC) and hydroisome-rization reactions. In order to effectively produce high VI component, such as iso-pafaffins and monocyclic naphtenes, it is important to load suitable HDC catalysts and operate them in the appropriate reaction conditions.　　Nippon Mitsubishi Oil Corporation (NMOC) and its affiliate company, Nippon Mitsubishi Petroleum Refining Company (NMPRC) reported their original HDC catalysts four years ago in this Japan-China joint se-minar in Beijing［1］. NMOC and NMPRC operate their hydrocracker both in fuel oil production mode and in lubricating oil production mode. In lubricating oil production mode, high VI lubricating oil called VHDC are produced.　　In this paper, at first, the advantages of high VI lubricating oil are described. And then it is announced that NMOC and NMPRC have developed a new generation of HDC catalyst with higher cracking activity, higher middle distillate selectivity and longer life than the other commercial HDC catalysts. In addition to those properties, the catalyst is able to yield high VI lubricating oil as well.

关键词：润滑油质量管理原油加工加氢裂化 HDC

Osmotic pressure of serum and cerebrospinal fluid in patients with suspected neurological conditions

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Neural Regeneration Research 2020年第5期15卷 944-947页

作者： Tetsuya Akaishi Toshiyuki Takahashi Ichiro Nakashima michiaki Abe Masashi Aoki Tadashi Ishii Department of Education and Support for Regional Medicine Tohoku University HospitalSendaiJapan Department of Neurology Tohoku University Graduate School of MedicineSendaiJapan Department of Neurology National Hospital Organization Yonezawa National HospitalYonezawaJapan Department of Neurology Tohoku Medical and Pharmaceutical UniversitySendaiJapan

Interstitial fluid movement in the brain parenchyma has been suggested to contribute to sustaining the metabolism in brain parenchyma and maintaining the function of neurons and glial *** pulsatile hydrostatic pressure gradient may be one of the driving forces of this bulk ***,osmotic pressure- related factors have not been studied until *** this prospective observational study,to elucidate the relationship between osmolality (mOsm/kg) in the serum and that in the cerebrospinal fluid (CSF),we simultaneously measured the serum and CSF osmolality of 179 subjects with suspected neurological *** osmolality was 283.6 ± 6.5 mOsm/kg and CSF osmolality was 289.5 ± 6.6 mOsm/*** the specific gravity of serum and CSF is known to be 1.024–1.028 and 1.004–1.007,respectively,the estimated average of osmolarity (mOsm/L) in the serum and CSF covered exactly the same range (i.e.,290.5–291.5 mOsm/L).There was strong correlation between CSF osmolality and serum osmolality,but the difference in osmolality between serum and CSF was not correlated with serum osmolality,serum electrolyte levels,protein levels,or quotient of *** conclusion,CSF osmolarity was suggested to be equal to serum *** is not one of the driving forces of this bulk *** factors such as hydrostatic pressure gradient should be used to explain the mechanism of bulk flow in the brain *** study was approved by the Institutional Review Board of the Tohoku University Hospital (approval *** No.2015-1-257) on July 29,2015.

关键词： brain parenchyma bulk flow cerebrospinal fluid hydrostatic pressure interstitial fluid osmolarity osmotic pressure

Frost heaving in ballast railway tracks

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Research in Cold and Arid Regions 2015年第5期7卷 632-636页

作者： Satoshi Akagawa michiaki Hori Cryosphere Engineering Laboratory Hokkaido Railway Campany

Frost heaving is a well-known phenomenon in cold regions, which may occur in wet clayey grounds during winter. Railway track upheaval occurring in cold regions during the winter is generally understood as frost heaving in the subgrade layer. However, it has been confirmed that upheaval due to frost heaving sometimes occurs in the ballast layer. This un- derstanding has been observed in active railways in northern Japan. The samples collected from ballast and subgrade layers have been examined for frost heave susceptibilities and confirmed that ballast layers which contain fines may heave.

关键词： frost heaving ballast layer subgrade layer railway track

新型糖基聚合物的合成及其作为高效液相色谱手性固定相的应用(英文)

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色谱 2016年第1期34卷 4-9页

作者： Tomoyuki ikai Takayuki YAMADA Graduate School of Natural Science and Technology Kanazawa University

Two novel polymers containing glucose units as the main-chain that only differ in terms of their regioregularity were synthesized to evaluate their chiral recognition abilities as chiral stationary phases(CSPs)for high performance liquid chromatography(HPLC).The regioregular polymer(poly-5)shows clear resolution ability for the racemate of cobalt(Ⅲ)acetylacetonate(Co(acac)3),whereas the corresponding regioirregular polymer(poly-3)does not show any chiral recognition for Co(acac)*** regioregular polymer main-chain seems to play an important role not only in providing an efficient interaction with the racemate but also in expressing the chiral recognition ability as a CSP for HPLC.

关键词：金属有机骨架化合物手性分离对映异构体选择性苇墩

Appropriate Heart Rate in a Patient with Repaired Tetralogy of Fallot

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Congenital Heart Disease 2022年第6期17卷 647-652页

作者： Aya Miyazaki Hideki Uemura Yasuyo Takeuchi Junya Tomida Yasuo Ono Yoshifumi Fujimoto Norie Mitsushita Akio ikai Department of Transitional Medicine Division of Congenital Heart DiseaseShizuoka General HospitalShizuokaJapan Congenital Heart Disease Center Nara Medical UniversityKashiharaJapan Department of Cardiology Shizuoka General HospitalShizuokaJapan Department of Clinical Engineering Shizuoka General HospitalShizuokaJapan

Appropriate heart rate in a failing pulmonary ventricle remains unknown, particularly in congenital heart diseasewith unique hemodynamics. A 71-year-old male with repaired tetralogy of Fallot and a pacemaker for a sinusnode dysfunction suffered from heart failure symptoms with preserved left ventricular function. Simply changingthe pacemaker’s lower rate from 60 to 75 bpm, New York Heart Association classification improved from III to II,and hemodynamic parameters drastically improved. We regarded this case as informative. Appropriate heart ratecould be higher in congenital patients with failing right and non-failing left ventricles than in adults with malfunctioningLV.

关键词： Heart rate repaired tetralogy of Fallot failing right ventricle pacemaker lower rate the right-left ventricular interaction