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Keling Hu,Zhujun Zhu,Yunxiang Zang,Syed Azhar Hussain 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.2
To understand how sulfur nutrition affects the quality and yield of vegetable plants, we have grown two cultivars of pakchoi (Brassica campestris L. ssp. chinensis var. communis cv. Shang Hai Qing and You Dong Er) hydroponically in nutrient solution supplied with two levels of sulfur (0.0558 mM as sulfur deficiency and 1.0058 mM as sulfur sufficiency, respectively) for three weeks and their growth, nutrient uptake and glucosinolate content under these two sulfur conditions were investigated. The results showed that plant growth of both the cultivars was inhibited by sulfur deficiency. The concentrations of nitrogen and magnesium in shoots of both the cultivars were increased notably under sulfur deficiency, but there was no significant change in concentrations of sulfur, potassium and calcium. Moreover, sulfur deficiency increased phosphorus uptake in You Dong Er but not in Shang Hai Qing. In Shang Hai Qing sulfur deficiency reduced the content of all individual and total glucosinolates, while in You Dong Er this was also the case for most individual and total glucosinolates. However, in You Dong Er the total aliphatic glucosinolate concentration was not significantly influenced but the concentrations of individual aliphatic glucosinolates-glucoalyssin and gluconapin were in contrast increased under sulfur deficiency. Our data show that sulfur deficiency will decrease the yield and deteriorate the quality of pakchoi vegetable by reducing its growth and the contents of nutrients and glucosinolates. In addition, there was a significant genotypic variation in the composition and content of glucosinolates between these two pakchoi cultivars when exposed to sulfur deficiency.
Yunxiang Zang,Hao Zhang,Linghui Huang,Fang Wang,Fei Gao,Xishan Lv,Jing Yang,Biao Zhu,홍승범,Zhujun Zhu 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.6
Glucosinolates have attracted considerable attention in the past several decades because of their involvement in pathogen and insect resistance of Brassicaceae as well as anti-inflammatory and anti-oxidation activity in humans. Methyl jasmonate (MeJA) treatment generally increases the levels of indole and aromatic glucosinolates; however, the time course of MeJA effects on the levels of individual glucosinolates in different pak choi cultivars has not been studied. Here, we found that foliar MeJA application increased accumulation of indole glucosinolates in both leaves and roots of four cultivars. However, roots accumulated much higher levels of indole glucosinolates and, compared to leaves, showed a delayed response to MeJA in terms of indole glucosinolate accumulation in all four cultivars. Individual indole glucosinolate levels in roots differed depending on the sampling time in different cultivars. The level of neoglucobrassicin steadily increased over 72 h. Glucobrassicin was induced in leaves of SHQ and HZYDE, and in roots of three cultivars, whereas 4-methoxyglucobrassicin was induced only in roots. Aromatic glucosinolate enrichment occurred only in roots. Aliphatic glucosinolates were detected only in the leaves but not in roots, accumulating to comparable levels as in untreated controls. These results suggest that exogenous MeJA-mediated signal transduction did not immediately lead to biosynthesis of aliphatic and aromatic glucosinolates but did induce increased accumulation of indole glucosinolates in pak choi. Individual glucosinolate accumulation profiles were different depending oncultivars.
Zhu Jun,Li Shaolong,Song Dandan,Han Qiaoli,Li guanghua 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.4
For the problem that the complexity of 3-D modeling and multi parameter optimization, as well as the uncertainty of the winding factor of axial flux permanent magnet generator with coreless windings. The complex 3-D model was simplified into 2-D analytic model, and an analytical formula for the winding factor that adapting different coreless stator winding is proposed in this paper. The analytical solution for air-gap magnetic fields, no-load back EMF, electromagnetic torque, and efficiency are calculated by using this method. The multiple objective and multivariable optimization of the maximum fundamental and the minimum harmonic content of back EMF are performed by using response surface methodology. The proposed optimum design method was applied to make a generator. The generator was tested and the calculated results are compared with the proposed method, which show good agreements.
Zhu Jun,Li Guanghua,Cao Di,Zhang Zhenyi,Li Shuaihui 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2
A 90° Halbach permanent magnet array coreless axial fux permanent magnet synchronous generator for wind power generation is compared with a conventional axial fux permanent magnet generator with cut cake type permanent magnet. 2D analytic model of generator is established. The air gap magnetic felds of two generators are analyzed by analytical method, and the air gap magnetic density and harmonic content are analyzed. Then the infuence of diferent parameters on voltage total harmonic distortion is analyzed by changing the pole arc coefcient, air gap length, permanent magnet thickness and number of turns. Two prototypes of generators are manufactured, and the correctness of the simulation results is verifed by experiments.