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- 저자 : Yunqi Wang (검색결과 3 건)
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Yifan Li,Yujie Wang,Bin Wang,Yunqi Wang,Weiqing Yu 한국식물학회 2019 Journal of Plant Biology Vol.62 No.2
The effects of particles on the photosynthesis ofvegetation, which is a sink for fine particulate matter (PM2.5)deposition, are still not well understood. Here, we carried outindoor measurements to evaluate the variation dynamics ofnet photosynthetic rate and stomatal conductance of fourplant species with different leaf characteristics under differentPM2.5 levels. Then tree leaves were sampled and the grooveproportion, leaf trichome density, stomatal density and stomatalsize were quantitatively studied by scanning electron microscopy(SEM). The stomatal conductance of the 4 species had aclose positive correlation with photosynthetic rate. Netphotosynthetic rate and stomatal conductance declined overtime at elevated PM2.5, and the rate of the decline becamemore rapid with higher concentration of PM2.5. The inhibitingeffect might be caused by the closure of the stomata and thedecrease of stomatal conductance, which was proved by thereduction of the stomatal size of under the condition of PM2.5pollution. Leaf trichome and groove seemed to show aprotective role for plants from PM2.5 exposure and be responsiblefor the difference of photosynthetic rate and stomatal conductanceunder the condition of PM2.5 pollution. The higher grooveproportion and the presence of trichomes on the leaf surfacein Neolitsea aurata and Lindera kwangtungensis absorbedsome particulate matters and buffered the effect of PM2.5pollution on stomata.
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Experiment and modeling of liquid-phase flow in a venturi tube using stereoscopic PIV
Song, Yuchen,Shentu, Yunqi,Qian, Yalan,Yin, Junlian,Wang, Dezhong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1
Venturi tube is based on turbulent flow, whereby the microbubbles can be generated by the turbulent fragmentation. This phenomenon is common in several venturi bubblers used by the nuclear, aerospace and chemical industries. The first objective of this paper is to study the liquid-phase velocity field experimentally and develop correlations for the turbulent quantities. The second objective is to research velocity field characteristics theoretically. Stereoscopic PIV measurements for the velocity field have been analyzed and utilized to develop the turbulent kinetic energy in the venturi tube. The tracking properties of the tracer particles have been verified enough for us to analyze the turbulence field. The turbulence kinetic energy has a bimodal distribution trend. Also, the results of turbulence intensity along the horizontal direction is gradually uniform along the downstream. Both the mean velocity and the fluctuation velocity are proportional to the Reynolds number. Besides, the distribution trend of the mean velocity and the velocity fluctuation can be determined by the geometric parameters of the venturi tube. An analytical function model for the flow field has been developed to obtain the approximate analytical solutions. Good agreement is observed between the model predictions and experimental data.
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Xiaodong Ji,Mulan Zhang,Yujie Wang,Yichu Song,Yaoyao Ke,Yunqi Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Immobilization of ammonium and phosphate by zeolites synthesized from low-calcium (LC-Z) and highcalcium (HC-Z) fly ashes is studied. LC-Z has higher ammonium immobilization capacity while HC-Z has better performance in phosphate uptake. As part of Ca2+ released from HC-Z compete with ammonium the exchangeable sites in LC-Z, LC-Z can affect phosphate immobilization of HC-Z, and HC-Z also lowers ammonium uptake of LC-Z. Separate dosing of LC-Z and HC-Z, i.e., first LC-Z and then HC-Z, is proved better than mixed dosing at simultaneous immobilization of ammonium and phosphate. The effect parameters for phosphate and ammonium immobilization of LTH-Z are investigated.
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