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- 저자 : Haipeng Yan (검색결과 3 건)
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Yan Jiakun,Li Haipeng,Li Yu,Zhang Nan,Zhang Suiqi 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.2
In rain-fed semi-arid agricultural areas, unevenly distributed seasonal rainfall influences tomato production. Meanwhile, jasmonic acid, an essential plant hormone, enhances plant resistance to biotic and abiotic stresses; however, its effect on tomato drought resistance remains unclear. In this study, a series of pot experiments were conducted to investigate the effects elicited via addition of exogenous methyl jasmonate (MeJA), an active ingredient of jasmonic acid, on tomato physiology, biochemistry, and transcription under two water conditions. The results indicate that 100 μM MeJA application significantly improved drought resistance in tomato and increased the biomass. Moreover, water deficiency significantly decreased the tomato plant photosynthetic rate, stomatal conductance, and root exudation and increased the leaf abscisic acid (ABA) con- tent. Meanwhile, MeJA application increased root exudation and whole plant transpiration rate to maintain relatively high leaf water content. In leaves, specifically, MeJA increased the expression of carotenoid cleavage dioxygenases and reduced ABA content, which might contribute to the maintenance of a high stomatal conductance. In addition, many genes involved in photosynthetic carbon metabolism and sugar transport were upregulated by MeJA, resulting in a low soluble sugar-to- starch ratio, to maintain plant growth. Collectively, these findings indicate that exogenous MeJA decreases ABA content to maintain high stomatal conductance and enhance root water uptake capacity to maintain improved leaf relative water status, consequently improving tomato drought resistance.
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Enhancement of CO2 desorption using ultrasound and vacuum in water scrubbing biogas upgrading system
Fuqiang Jin,Haipeng Xu,Dongliang Hua,Lei Chen,Yan Li,Yuxiao Zhao,Bin Zuo 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1
Ultrasound and vacuum were respectively employed to enhance CO2 desorption in a water scrubbing biogas upgrading system. Results showed that incomplete CO2 desorption could cause a high CO2 content in the water and seriously affect the purity of the product gas. Vacuum had a strong enhancement effect on CO2 desorption. When a vacuum of 0.04MPa was used to enhance CO2 desorption, the amount of the stripping air could be reduced to 1/16- th of that without enhancement, indicating that vacuum could greatly enhance CO2 desorption and significantly decrease the amount of the stripping air, which was expected to reduce a large amount of energy consumption. In contrast, the enhancement effect of ultrasound was not so obvious for CO2 desorption in the desorption column with air stripping, since the solution could be well desorbed by gas stripping, though ultrasound could strongly affect the static CO2 desorption.
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Performance of Ion Plating TiAlN Coating on YG8
Huixia Zhang,Chonglin Liu,Long Lu,Haipeng Yan,류성기 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.2
Multi-arc ion plating technology and interactive deposition process are adopted to plate TiAlN hard film on the surface of YG8 cemented carbide cutting tools. Study the influences of the coating film parameters to surface appearance with orthogonal experiment method. Observe substrate samples, TiN transition layer and TiAlN coating film under the scanning electron microscope (SEM). Cutting test, friction and wearing test showed that the coated cutting tools are with more wearing resistance. The main wear mechanisms are adhesion, some accompanied by flake layer of disbanding. Coated cutting tools significantly reduces friction coefficient. By experimental design, the best process parameters are deposition temperature 100oC, substrate negative bias voltage 250 V, nitrogen partial pressure 0.6 Pa.
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