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Fuwu Yan,Junjun Wang,Dong Yan,Wenlong Zhang,Guoqing Zhang,Jizhou Zhang,Ziyi Chen,Yu Wang 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.4
This paper studied the effects of water injection on combustion, emissions and knock. The results showed that direct water injection (DWI) absorbed more heat than inlet port water injection (PWI), resulting in lower cylinder pressure, higher oxygen content and longer combustion duration. And the turbulence kinetic energy of DWI model was greater, resulting in lower soot and CO emissions of DWI. Furthermore, the cooling effect of exhaust port side WI was better than intake port side, which reduced NOX emission. Besides, the injection pressure of single injector WI was higher than double injector, which increased the combustion duration and reduced the cylinder pressure. The decrease of temperature under water dilution was the main reason for the reduction of NOX, while the increase of incomplete combustion increased the soot and CO emission. Finally, with the same amount of WI, the knock suppression effect of DWI models was better than PWI models. The knock intensity (KI) of all models decreased gradually with the increase of water, and DWI models decreased more rapidly. For PWI models, when the amount of water became smaller, the engine pressure fluctuation of certain areas in the cylinder increased slightly, weakening the influence of WI on engine knock.
Yan Sun,Jizhou Zhang,Lokenath Debnath 장전수학회 2011 Advanced Studies in Contemporary Mathematics Vol.21 No.1
In this paper, we consider the existence of multiple positive solutions for the second order nonlinear boundary value problem on the half-line [수식] where [수식] is continuous. Some weaker conditions are imposed on g yields the existence of at least three symmetric positive solutions.
Li Zhao,Jizhou Lv,Fei Li,Kairui Li,Bo He,Luyao Zhang,Xueqing Han,Huiyu Wang,Nicholas Johnson,Xiangmei Lin,Shaoqiang Wu,Yonghong Liu 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.1
Livestock husbandry is vital to economy of the Tarim Basin, Xinjiang Autonomous Region, China. However, there have been few surveys of the distribution of ixodid ticks (Acari: Ixodidae) and tick-borne pathogens affecting domestic animals at these locations. In this study, 3,916 adult ixodid ticks infesting domestic animals were collected from 23 sampling sites during 2012-2016. Ticks were identified to species based on morphology, and the identification was confirmed based on mitochondrial 16S and 12S rRNA sequences. Ten tick species belonging to 4 genera were identified, including Rhipicephalus turanicus, Hyalomma anatolicum, Rh. bursa, H. asiaticum asiaticum, and Rh. sanguineus. DNA sequences of Rickettsia spp. (spotted fever group) and Anaplasma spp. were detected in these ticks. Phylogenetic analyses revealed possible existence of undescribed Babesia spp. and Borrelia spp. This study illustrates potential threat to domestic animals and humans from tick-borne pathogens.
Fundamental effects in nanoscale thermocapillary flow
Hun Jin, Sung,Song, Jizhou,Uk Chung, Ha,Zhang, Chenxi,Dunham, Simon N.,Xie, Xu,Du, Frank,Kim, Tae-il,Lee, Jong-Ho,Huang, Yonggang,Rogers, John A. American Institute of Physics 2014 Journal of Applied Physics Vol.115 No.5
When implemented on the nanoscale, material flows driven by gradients in temperature, sometimes known as thermocapillary flows, can be exploited for various purposes, including nanopatterning, device fabrication, and purification of arrays of single walled carbon nanotubes (SWNTs). Systematic experimental and theoretical studies on thermocapillary flow in thin polymer films driven by heating in individual metallic SWNT over a range of conditions and molecular weights reveal the underlying physics of this process. The findings suggest that the zero-shear viscosity is a critical parameter that dominates the dependence on substrate temperature and heating power. The experimentally validated analytical models in this study allow assessment of sensitivity to other parameters, such as the temperature coefficient of surface tension, the thermal interface conductance, and the characteristic length scale of the heated zone. (c) 2014 AIP Publishing LLC.