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Behavior of piston rings passing over cylinder ports in two-stroke cycle engines
Kohei Nakashima,Yuki Nakano,Soichi Ishihara,Yoshio Murakami,Masago Yamamoto 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
In two-stroke cycle engines, the piston and piston ring slide over not only the cylinder wall but also the cylinder ports. This study investigates whether piston rings project and get caught in the cylinder ports. We installed strain gauges, on the bottom sides of piston rings,over the intake and exhaust ports, and plotted the variation of strain per cycle, while running the engine. By examining the variation in strain on the bottom of the piston ring, we clarified that our piston ring indeed became momentarily caught in the cylinder ports.
Dopant-dependence on Charge-orbital Order in Impurity Doped Layered Manganites
Yuki Yamaki,Yuichi Yamasaki,Hironori Nakao,Youichi Murakami,Yoshio Kaneko,Yoshinori Tokura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
In this study we have investigated dopant effects on a typical charge-orbital ordered state ina single layered manganite La0.5Sr1.5MnO4 using magnetization measurement and resonant x-rayscattering technique. We have studied how the charge-orbital ordered state is affected by the 3%substitution of Cr, Fe and Ga ions for Mn ions. It is revealed that the impurity doping suppresses thelong-range charge-orbital order, in which the degree of suppression strongly depends on dopant ions,and eventually forms a phase-separated ground state between charge-orbital order and ferromagneticstates.