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RISS 인기검색어
- 검색키워드
- 저자 : Dehao Jin (검색결과 3 건)
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The effects of temperature on evaporation and coking of gasoline droplets on a hot surface
( Haoyi Song ),( Jin Xiao ),( Xinqi Qiao ),( Dehao Ju ),( Zhen Huang ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
The gasoline direct injection engine faced a much severe injector deposits problem compared with PFI engine because the nozzle of GDI injector was designed to extrude into the combustion chamber and had to be directly exposed to the high temperature combustion gas. The internal deposit formation in the injector nozzle can both restrict the fuel flow and alter the spray characteristics of the injectors, which will lead to the loss in power and fuel economy, as well as the increase of exhaust emissions. Thus it is of great significance to learn about the formation mechanism of these deposits. It’s acknowledged that the internal deposits derived from the oxidation of the remaining gasoline after injection at a relatively low temperature, generally lower than 200 °C. In this paper, a special facility was designed to investigate the evaporation and coking behavior of gasoline droplets. In the experiments, 10ml of gasoline dropped one by one droplet onto a hot surface which was heated to a certain temperature. The evaporation processes of the droplets were observed by high speed camera and the components of gasoline droplet as well as those of the remaining after coking were also examined. What’s more, the accurate qualities of deposits after coking at different temperature were measured to identify the influence of coking temperature on the amount of deposits formation. Results showed that the droplets evaporated as a ball on the hot surface at a temperature of about 5 °C lower than the final boiling point of the gasoline, which meant that it reached the gasoline’s Leidenfrost temperature. Besides, the qualities of deposits after coking increased with the increase of surface temperature firstly and then decreased and it increased again and then decreased as the surface temperature closed to its Leidenfrost temperature.
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( Zhong Huang ),( Tingting Zhang ),( Dehao Ju ),( Xinqi Qiao ),( Jin Xiao ),( Zhen Huang ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
The fuel spray behavior has a significant impact on the performance and emission characteristics of the compression ignition engine. It controls the fuel air mixing, which in turns is critical for the combustion process. The differences in the physical properties of convention diesel and the diesel from coal indirect liquefaction (DICL) are expected to result in differences in their spray characteristics, thus, in the performance and emission characteristics of the engine. The aim of this work is to analyze the atomization characteristics of the DICL and compare the global and local flow characteristics of the DICL with the NO.2 diesel (D2) at engine conditions. A surrogate fuel of the DICL (a mixture of 72.4% n-dodecane and 27.6% methylcyclohexane by mass) was built according to its components to simulate the atomization characteristics of the DICL in the non-reacting high temperature and high pressure environment. The implicit Large Eddy Simulation (LES) was used together with the Lagrangian particle tracking approach for the liquid phase in the present study. The simulation results show that the liquid penetration of the DICL is shorter than that of theD2, while there is no significant difference in the vapor penetration of the two fuels. In addition, the gas-phase axial velocity of the DICL along the spray center line is slightly larger than that of D2 in upstream of the spray. Moreover, the SMD of the DICL is larger than that of D2. The studies on the effects of the injection pressure on the atomization characteristics of the DICL were also carried out. The results imply that the injection pressure of the DICL is not required as large as the injection pressure for D2 to generate the same spray quality. This study is helpful to understand the differences in the atomization characteristics between DICL and D2.
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Increased Serum Cathepsin K in Patients with Coronary Artery Disease
Xiang Li,Lan Cui,Yuzi Li,Jiyong Jin,Dehao Jin,Xiangshan Li,Yanna Rei,Haiying Jiang,Guangxian Zhao,Guang Yang,Enbo Zhu,Yongshan Nan,Xianwu Cheng 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.4
Purpose: Cathepsin K is a potent collagenase implicated in human and animal atherosclerosis-based vascular remodeling. This study examined the hypothesis that serum CatK is associated with the prevalence of coronary artery disease (CAD). Materials and Methods: Between January 2011 and December 2012, 256 consecutive subjects were enrolled from among patients who underwent coronary angiography and percutaneous coronary intervention treatment. A total of 129 age-matched subjects served as controls. Results: The subjects’ serum cathepsin K and high sensitive C-reactive protein (hs-CRP) and high-density lipoprotein cholesterolwere measured. The patients with CAD had significantly higher serum cathepsinK levels compared to the controls (130.8±25.5 ng/mL vs. 86.9±25.5 ng/mL, p<0.001), and the patients with acute coronary syndrome had significantly higher serum cathepsin K levels compared to those with stable angina pectoris (137.1± 26.9 ng/mL vs. 102.6±12.9 ng/mL, p<0.001). A linear regression analysis showed that overall, the cathepsin K levels were inversely correlated with the high-density lipoprotein levels (r=-0.29, p<0.01) and positively with hs-CRP levels (r=0.32, p<0.01). Multiple logistic regression analyses shows that cathepsin K levels were independent predictors of CAD (odds ratio, 1.76; 95% confidence interval, 1.12 to 1.56; p<0.01). Conclusion: These data indicated that elevated levels of cathepsin K are closely associated with the presence of CAD and that circulating cathepsin K serves a useful biomarker for CAD.
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