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Effects of hydraulic oil and lubricant additives on dynamic friction properties under various reciprocating sliding conditions

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Friction 2020年第2期8卷 471-480页

作者： Shinji kato Shinya SASAKI Engineering Headquarters Automotive ComponentsKYB Corporation2548DolaKani-shiGifu 509-0298Japan Department of Mechanical Engineering Faculty of Engineering Division ITokyo University of Science6-3-1NiijukuKatsushika-kuTokyo 125-8585Japan

The friction characteristics of a shock absorber are very complex because the reciprocating motion is not always *** this study,a device was developed and used to analyze the dynamic friction characteristics under various reciprocating sliding conditions to determine the sliding materials and hydraulic oils that improve the shock absorber *** study describes the influence of hydraulic oil additive on the fine reciprocating friction characteristics of steel and copper *** oils were prepared by blending a paraffinic mineral oil with zinc dithiophosphate(ZnDTP)and polyhydric alcohol ester as *** results show that the dynamic frictional characteristics vary mainly depending on the additive concentration.A specific additive formulation induces a unique amplitude-dependent friction *** addition,the influence of different additives on the lubrication mechanism is investigated based on the instrumental analysis of the friction surface.

关键词： shock absorber dynamic friction reciprocating friction additive zinc dithiophosphate(ZnDTP)

GPS monitoring of temporal deformation of the Xianshuihe fault

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Science China Earth Sciences 2008年第9期51卷 1259-1266页

作者： TERUYUKI kato Earthquake Research Institute University of TokyoTokyo Japan

Highly precise (σ ~1 mm) temporal deformation measurements are taken across the Xianshuihe fault from two pairs of continuous GPS stations straddling the fault. Baseline vector changes of the two pairs of stations show clearly the difference in deformation behavior between the Qianning and Daofu segments of the fault: the former deforms steadily, and the latter deforms with a strong transient component. The transient deformation across the Daofu segment is possibly related to its irregular geometry, where the fault splits into two branches, that is, the east and west branches. An attempt is made to interpret the baseline vector changes using a kinematic fault model composed of a brittle layer in the upper crust, a ductile layer in the lower crust, and a transition zone in between. The slip in the transition zone of the south segment of the Xianshuihe fault is steady. The slips in the transition zones of the north and Daofu segments of the Xianshuihe fault, however, are not steady, and the average slip rates there are higher than that of the south segment. The difference in deformation behavior is probably associated with the rheological properties of the fault interface, suggesting that the overall fault strength of the south segment is greater than those of the north and Daofu segments, corresponding to longer earthquake recurrence time.

关键词： Xianshuihe fault GPS deformation field temporal change brittle-ductile transition zone

Diagnosis and therapies for gastric non-invasive neoplasia

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World Journal of Gastroenterology 2015年第44期21卷 12513-12518页

作者： Motohiko kato Department of Gastroenterology National Hospital Organization Tokyo Medical Center

There has been a great discrepancy of pathological diagnosis for gastric non-invasive neoplasia/dysplasia between Japanese and western pathologists. In Japan, lesions that most western pathologists diagnose as dysplasia are often considered adenocarcinoma based on nuclear and structural atypia regardless of the presence of invasion. In the Vienna classification, gastric non-invasive intraepithelial neoplasia(NIN) weredivided into low grade and high grade(including intramucosal cancer of Japanese criteria). The diagnosis by both endoscopy and pathology of biopsy specimen is difficult. Recent advances of diagnostic modality such as magnified endoscopy and imaged enhanced endoscopy is expected to improve the diagnostic yield for NIN. There are two treatment strategies for NIN, observation and diagnostic therapy by endoscopic resection(ER). ER is acceptable because of its less invasiveness and high local control rate, on the other hand, cancer-developing rate of low-grade NIN is reported to be low. Therefore there is controversy for the treatment of gastric NIN. Prospective study based on unified pathological definition is required in the future.

关键词： Gastric Non invasive intraepithelial neoplasia Ade

ON CORRELATION OF CAVITATION EROSION AND NOISE ON A FOIL SECTION

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Journal of Hydrodynamics 1990年第3期2卷 88-96页

作者： kato H Maeda M University of Tokyo 7-3-1HongoBunkyo-KuTokyo 113Japan

Tests with two different sized models were conducted in the Marine Propeller Cavitation Tunnel at the Univer- sity of *** two angles of attack the developed sheet-cloud and bubble cavitation *** pattern was recorded by pure indium specimens and noise was measured with a hydrophone mounted inside the *** broadband SPL was mainly used for correlation of noise with pit counting results from *** case of sheet- cloud cavitation power law relations between velocity and SPL have been found and there existed a linear relation- ship between SPL values and IgPR values(PR-pitting rate).However in case of bubble cavitation such power law relation does not exist between pitting rate and velocity,and neither between SPL and *** was noticed that the different trends of SPL for these two different types of cavitation could be qualitatively linked to their pitting rates by using some SPL values at high center frequencies.

关键词： ON CORRELATION OF CAVITATION EROSION AND NOISE ON A FOIL SECTION PP NACA

Functional imaging of astrocyte activity

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Neural Regeneration Research 2021年第6期16卷 1206-1207页

作者： Hiroki kato Tatsusada Okuno Department of Nuclear Medicine and Tracer Kinetics Osaka University Graduate School of Medicine2-2 Yamadaoka SuitaOsakaJapan Department of Neurology Osaka University Graduate School of Medicine2-2 Yamadaoka SuitaOsakaJapan

Astrocytes have become known to play a central role in various neuroinflammatory *** evaluation of astrocyte activity using functional imaging is becoming more *** metabolism or oxygen metabolism in the brain can be assessed using the established clinical imaging methods of F-18 fluorodeoxyglucose positron emission tomography(PET)and O-15 PET,***,until recently,the highly specific evaluation of metabolic activity in astrocytes has never been applied *** acetate is selectively taken up and metabolized by astrocytes,its usefulness as a tracer for measuring astrocyte activity has been proposed in basic research.

关键词： metabolism assessed clinical

On a New Geometric Constant Related to the Modulus of Smoothness of a Banach Space

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Acta Mathematica Sinica,English Series 2014年第9期30卷 1526-1538页

作者： Yasuji TAKAHASHI Mikio kato Department of System Engineering Okayama Prefectural University Department of Mathematics Faculty of EngineeringShinshu University

We shall introduce a new geometric constant A（X） of a Banach space X, which is closely related to the modulus of smoothness px （T）, and investigate it in relation with the constant As （X） by Baronti et al., the von Neumann-Jordan constant CNj（X） and the James constant J（X）. A sequence of recent results on these constants as well as some other geometric constants will be strengthened and improved.

关键词： Constant A(X) von Neumann-Jordan constant James constant modulus of smoothness modulus of convexity uniform non-squareness

Improvement in growth yield of single-walled carbon nanotubes with narrow chirality distribution by pulse plasma CVD

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 485-492页

作者： Bin Xu Toshiro Kaneko Toshiaki kato Department o f Electronic Engineering Tohoku UniversitySendai 980-8579Japan Japan Science and Technology Agency (JST)-PRESTO Sendai 980-8579Japan

A pulse plasma chemical vapor deposition (CVD) technique was developed for improving the growth yield of single-walled carbon nanotubes (SWNTs) with a narrow chirality distribution. The growth yield of the SWNTs could be improved by repetitive short duration pulse plasma CVD, while maintaining the initial narrow chirality distribution. Detailed growth dynamics is discussed based on a systematic investigation by changing the pulse parameters. The growth of SWNTs with a narrow chirality distribution could be controlled by the difference in the nucleation time required using catalysts comprising relatively small or large particles as the key factor. The nucleation can be controlled by adjusting the pulse on/ofF time ratio and the total processing time.

关键词： single-walled carbon nanotubes chiralitycontrolled synthesis pulse plasma chemical vapor deposition

Friction and Wear Properties of Amorphous Carbon Nitride Coatings in Water Lubrication

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Transactions of Nanjing University of Aeronautics and Astronautics 2014年第5期31卷 463-477页

作者：周飞 Koji kato State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and Astronautics Laboratory of Tribology School of Mechanical EngineeringNihon UniversityFukushima963-8642Japan

The friction and wear properties of amorphous carbon nitride(a-CN x)coatings in water lubrication were *** influences of mating materials and tribological variables such as normal load(W)and sliding speed(V)on the friction and wear properties of the a-CN x coatings were *** was indicated that the specific wear rate of the a-CN x coatings was related to the hydration reaction of mating materials with *** the mating materials were easily hydrated,the specific wear rate of a-CN x coatings was *** water-lubricated properties of the a-CN x coatings were better in comparison to the a-C *** a-CN x/Si-based non-oxide ceramics tribo-pairs exhibited the lowest friction coefficient and wear *** describe their friction and wear properties at the normal loads of 3—15Nand the sliding speeds of 0.05—0.5m/s,the wear-mechanism maps for the a-CN x/SiC(Si3N4)tribo-pairs in water were developed.

关键词： amorphous carbon nitride(a-CNx) coatings friction wear water lubrication

Experimental and Numerical Investigation on Compressor Cascade Flows with Tip Clearance at a Low Reynolds Number Condition

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Journal of Thermal Science 2011年第6期20卷 481-485页

作者： Hiromasa kato Hideo Taniguchi Kazunari Matsuda Ken-ichi Funazaki Dai kato Guillaume Pallot Department of Mechanical Engineering Faculty of EngineeringIwate University Aerodynamic Technology Group IHI Corporation

High flow rate aeroengines typically employ axial flow compressors, where aerodynamic loss is predominantly due to secondary flow features such as tip leakage and comer vortices. In very high altitude missions, turbo- machinery operates at low density ambient atmosphere, and the recent trend toward more compact engine core inevitably leads to the reduction of blade size, which in turn increases the relative height of the blade tip clearance. Low Reynolds number fiowfield as a result of these two factors amplifies the relative importance of secondary flow effects. This paper focuses on the behavior of tip leakage flow, investigating by use of both experimental and numerical approaches. In order to understand the complex secondary flow behavior, cascade tests are usually conducted using intrusive probes to determine the loss. However relatively few experimental studies are pub- lished on tip leakage flows which take into account the interaction between a rotating blade row and its casing wall. Hence a new linear cascade facility has been designed with a moving belt casing in order to reproduce more realistic flowfield as encountered by a rotating compressor row. Numerical simulations were also performed to aid in the understanding of the complex flow features. The experimental results indicate a significant difference in the flowfield when the moving belt casing is present. The numerical simulations reveal that the leakage vortex is pulled by the shearing motion of the endwall toward the pressure side of the adjacent blade. The results highlight the importance of casing wall relative motion in analyzing leakage flow effects.

关键词： compressor tip leakage flow