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Engine stoppage mechanism of small boats during stormy weather
Naohiro YAMATANI,Atumu TEZAKI,Toshihiko NAKATANI,Noriko NISHII,Hiroshi MIKAMI 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
About 20% of maritime accidents involving small boats are caused by engine trouble. If the main engine stops under stormy conditions, then the operator might lose control of the boat, which might then overturn. In the worst case, such accidents can lead to injury and death. A main reason for sudden engine stoppage is that air bubbles form in the fuel line. That hazard has persisted as an important problem for small boats for many years. The present situation is that no decisive or effective countermeasure has been taken for boats. Some preliminary experiments were conducted to elucidate how air bubbles in the fuel line can be prevented when the boat rolls and pitches on the ocean. This research presents specific measures to prevent maritime accidents related to small boats.
Changes in fuel injection pressures and fuel spray quantity of marine diesel engines
Naohiro YAMATANI,Atsumu TEZAKI,Sotomi ISHIHARA,Toshihiko NAKATANI,Noriko NISHII,Hiroshi MIKAMI 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
When four-stroke diesel engines operate over long durations, it is well known that the fuel injection pressure decreases steadily, and then often followed by incomplete combustion in engine. Poor combustion in engine caused by the pressure drop is a big problem because it causes environmental pollution. However, changes in the exhaust temperature in four-stroke diesel engines occur more slowly than that in the fuel injection pressure. So, the effects of the fuel-injection-pressure drop on the exhaust gas temperature and maximum pressure do not appear in the operating data. It is difficult to grasp the combustion state from the operating data of an actual machine. This study aimed to observe and investigate carefully the phenomena that were accompanied with a drop in the fuel injection pressure.
Noboru Hasegawa,Akira Sasaki,Hiroshi Yamatani,Maki Kishimoto,Momoko Tanaka,Yoshihiro Ochi,Masaharu Nishikino,Yuichi Kunieda,,Hitoki Yoneda,Atsushi Iwamae 한국광학회 2009 Current Optics and Photonics Vol.13 No.1
We attempted the first measurement of the spectral width of the nickel-like molybdenum x-ray laser ( = 18.895 nm) by use of a high-resolution spectrometer in order to determine the strength of the magnetic field required for the generation of a circularly polarized x-ray laser. The spectral width was measured to be = 18 mÅ under the substantial lasing condition. The magnetic field required for the generation of a circularly polarized x-ray laser was 40 T. The splitting of the x-ray laser line was clearly obtained under 15 T external magnetic field. The strength of the magnetic field estimated from the splitting of the x-ray laser line was large compared with the external magnetic field. It implies that there might be an alternative mechanism for enhancement of the magnetic field in the gain medium plasma.