A heavy ion beam probe （HIBP） using a 3-MV tandem accelerator has been installed on large helical device （LHD）. Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of ...A heavy ion beam probe （HIBP） using a 3-MV tandem accelerator has been installed on large helical device （LHD）. Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of up to 3 T. By using the HIBP, the transition of potential profiles from electron-root to ion^root is observed in core plasmas during ramp-up of the electron density. Potential fluctuations are also measured electron cyclotron current drive （ECCD）. Two kind of characteristic fluctuations are observed. One is a reversed-shear-induced Alfv^n eigenmode （RSAE）, whose frequency varies during the evolution of the rotational transform profile, and the other is with a constant geodeisc acoustic mode （GAM） frequency.展开更多
The friction characteristics of a shock absorber are very complex because the reciprocating motion is not always identical.In this study,a device was developed and used to analyze the dynamic friction characteristics ...The friction characteristics of a shock absorber are very complex because the reciprocating motion is not always identical.In 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 performance.This study describes the influence of hydraulic oil additive on the fine reciprocating friction characteristics of steel and copper alloy.Hydraulic oils were prepared by blending a paraffinic mineral oil with zinc dithiophosphate(ZnDTP)and polyhydric alcohol ester as additives.The results show that the dynamic frictional characteristics vary mainly depending on the additive concentration.A specific additive formulation induces a unique amplitude-dependent friction behavior.In addition,the influence of different additives on the lubrication mechanism is investigated based on the instrumental analysis of the friction surface.展开更多
基金MEXT Japan under Grant-in-Aid for Young Scientists (Nos.16760674,18760640)the JSPS-CAS Core-University program in the field of Plasma and Nuclear FusionNIFS/NINS under the project of Formation of International Network for Scientific Collaborations and NIFS07ULBB505
文摘A heavy ion beam probe （HIBP） using a 3-MV tandem accelerator has been installed on large helical device （LHD）. Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of up to 3 T. By using the HIBP, the transition of potential profiles from electron-root to ion^root is observed in core plasmas during ramp-up of the electron density. Potential fluctuations are also measured electron cyclotron current drive （ECCD）. Two kind of characteristic fluctuations are observed. One is a reversed-shear-induced Alfv^n eigenmode （RSAE）, whose frequency varies during the evolution of the rotational transform profile, and the other is with a constant geodeisc acoustic mode （GAM） frequency.
文摘The friction characteristics of a shock absorber are very complex because the reciprocating motion is not always identical.In 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 performance.This study describes the influence of hydraulic oil additive on the fine reciprocating friction characteristics of steel and copper alloy.Hydraulic oils were prepared by blending a paraffinic mineral oil with zinc dithiophosphate(ZnDTP)and polyhydric alcohol ester as additives.The results show that the dynamic frictional characteristics vary mainly depending on the additive concentration.A specific additive formulation induces a unique amplitude-dependent friction behavior.In addition,the influence of different additives on the lubrication mechanism is investigated based on the instrumental analysis of the friction surface.
