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Measurement of Mass Distribution in Diesel Fuel Spray by Using Micro-probe L2F
( Keisuke Komada ),( Daisaku Sakaguchi ),( Hironobu Ueki ),( Masahiro Ishida ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
A laser 2-focus velocimeter (L2F) has been applied to measure the velocity and size of droplets in the dense region of diesel spray. Measurement was conducted on the fuel spray injected intermittently into the atmosphere from an injector nozzle with the orifice diameter of 0.113 mm. The injection pressure was set at 40 MPa by using a common rail system. The L2F had a micro-scale probe which consisted of two foci. The focal diameter was about 3 m, and the distance between two foci was 17 m. The data sampling rate of the L2F system was markedly high as 15 MHz. Measurement was conducted at 5 mm downstream from the nozzle exit. The local mass flow rate and the number density were calculated from the measured velocity, size, and arrival time of droplets. It was clearly shown that the mass flow rate was higher at the front of the spray than at the inside, and was higher at the spray center than at the peripheral portion of the spray. The accumulated mass flow in the spray section measured by the L2F was 43% of the injected fuel mass.
Frame Vibration Suppression Method for Sensorless PMSM Drive Applications
Supharat Suthep,Yankai Wang,Muneaki Ishida,Naoki Yamamura,Kazuhiro Yubai,Satoshi Komada 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6
This study proposes a novel frame anti-vibration controller for position sensorless PMSM drive application. This controller is called specific component reduction controller (SCRC). SCRC can function without an accelerometer and can achieve speed variable control. This study mainly comprises the following phases. First, the position sensorless control method will be provided. Second, the frame vibration model and load torque ripple will be shown. Third, SCRC will be discussed and its stability will be analyzed. Finally, experimental results show that SCRC can achieve speed variable anti-vibration control and compensate target frequency torque ripple.
Frame Vibration Suppression Method for Sensorless PMSM Drive Applications
Suthep, Supharat,Wang, Yankai,Ishida, Muneaki,Yamamura, Naoki,Yubai, Kazuhiro,Komada, Satoshi The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6
This study proposes a novel frame anti-vibration controller for position sensorless PMSM drive application. This controller is called specific component reduction controller (SCRC). SCRC can function without an accelerometer and can achieve speed variable control. This study mainly comprises the following phases. First, the position sensorless control method will be provided. Second, the frame vibration model and load torque ripple will be shown. Third, SCRC will be discussed and its stability will be analyzed. Finally, experimental results show that SCRC can achieve speed variable anti-vibration control and compensate target frequency torque ripple.
Sekijima Hidehisa,Oshima Toru,Ueji Yuno,Kuno Naoko,Kondo Yukino,Nomura Saera,Asakura Tomomi,Sakai-Sugino Kae,Kawano Mitsuo,Komada Hiroshi,Kotani Hirokazu 한국독성학회 2023 Toxicological Research Vol.39 No.3
Benzalkonium chloride (BAC) intoxication causes fatal lung injuries, such as acute lung injury (ALI) and acute respiratory distress syndrome (ARDS). However, the pathogenesis of ALI/ARDS induced by BAC ingestion is poorly understood. This study aimed to clarify the mechanism of lung toxicity after BAC ingestion in a mouse model. BAC was orally administered to C57BL/6 mice at doses of 100, 250, and 1250 mg/kg. After administration, BAC concentrations in the blood and lungs were evaluated via liquid chromatography with tandem mass spectrometry. Lung tissue injury was evaluated via histological and protein analyses. Blood and lung BAC concentration levels after oral administration increased in a dose-dependent manner, with the concentrations directly proportional to the dose administered. The severity of lung injury worsened over time after the oral administration of 1250 mg/kg BAC. An increase in the terminal transferase dUTP nick end labeling-positive cells and cleaved caspase-3 levels was observed in the lungs after 1250 mg/kg BAC administration. In addition, increased cleaved caspase-9 levels and mitochondrial cytochrome c release into the cytosol were observed. These results suggest that lung tissue injury with excessive apoptosis contributes to BAC-induced ALI development and exacerbation. Our findings provide useful information for developing an effective treatment for ALI/ARDS induced by BAC ingestion.