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External Magnetic Field of Journal Bearing with Twined Solenoid
Yanjuan Zhang,Jianmei Wang,Decai Li 한국자기학회 2017 Journal of Magnetics Vol.22 No.2
In this paper, the distribution of internal magnetic induction intensity of oil-film bearing twined solenoids was proposed. The magnetic field was generated by solenoids and magnetized bearing. The magnetized bearing was simplified as solenoid model. The mathematical model of magnetic induction intensity at any point of finite solenoid was deduced. Through experiment method, the distribution of the internal magnetic induction intensity of oil-film bearing and the magnetizing current formula of bearing was obtained. Further, the magnetic induction intensity distribution of magnetization bearing was solved successfully. The results showed that the magnetic induction was a second-degree parabola with open upwards along the axial plane and the distribution of magnetic induction intensity was opposite to the rule of magnetic induction intensity generated by solenoids. In addition, the magnetic flux density increased linearly with the increase of current.
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Jian Zhang,Yanjuan Wang,Shaozheng Hu 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.1
A carbon nitride/TiO2 nanofiber heterojunction photocatalyst that is responsive to simulated solar light is prepared by a simple self-assembly method. X-ray diffraction (XRD), UV–vis spectroscopy, scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) are used to characterize the prepared catalysts. The results indicate that the TiO2 nanofiber is coated by the g-C3N4 sheet to form a core/shell structure, which is favorable for the fast interfacial charge transfer and separation of the photogenerated electron–hole pairs. The activity and stability of carbon nitride/TiO2 nanofiber heterojunction photocatalyst are tested in the photocatalytic degradation of rhodamine B (RhB) under simulated solar light. The rate constant of TiNF(0.3)-CN is found to be 0.044 min−1, which is 4 and 2.2 times higher than that of single TiO2 nanofiber and g-C3N4, respectively. A possible mechanism is proposed.
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Numerical Analysis and Experiment Study of Magnetic Fluid Boundary in Seals
Yibiao Chen,Decai Li,Yanjuan Zhang,Anmin Xi 한국자기학회 2018 Journal of Magnetics Vol.23 No.2
Magnetic fluid seals are widely used technical applications of magnetic fluid. This paper presents a numerical simulation model to obtain the boundary of magnetic fluid in seals. The magnetic field in the seal is solved by finite element method, and the boundary is calculated by using Navier-Stokes equations in magnetic fluid. In order to observe the surface and obtain the seal capacity, the plane magnetic fluid seal experiment is carried out. The relationship between the seal capacity and the magnetic fluid volume is presented. The seal capacity which is obtained by the theoretical analysis has well congruence with the result of the experiment. The displacement of boundary with the pressure difference is quantitatively depicted.
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Dynamic simulation and analysis of the elevating mechanism of a forklift based on a power bond graph
Yao Wang,Dingxuan Zhao,Lei Wang,Zhuxin Zhang,Lili Wang,Yanjuan Hu 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.9
An electric elevating mechanism is designed based on the working principle of the lifting equipment for the CPD30 forklift. The mathematical models based on the power bond graph for an electric elevating system and a hydraulic elevating system are built by considering the execution condition of the fork arms of a forklift, including starting, rising and braking. On the basis of these models, dynamic simulation and analysis are performed for the starting, rising and braking of the fork arms frame. Then, the corresponding mathematical model is derived. Furthermore, the curve of the movement velocity of the fork arms frame is determined. The characteristics of the two types of lifting mechanism are summarized for two types of working effect of the lifting system under the same conditions by comparing the difference between the actual trajectory curve and the curve of the original plan. The theoretical foundations for the type selection of the forklift elevating mechanism and even that of engineering machinery are provided.
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Chlorogenic acid accumulation and related gene expression in peach fruit
Yan Juan,Su Ziwen,Guo Shaolei,Zhang Minghao,Zhang Binbin,Cai Zhixiang,Shen Zhijun,Ma Ruijuan,Yu Mingliang 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.3
To reveal the molecular mechanism in the accumulation of chlorogenic acids (CGAs) in peach (Prunus persica) fruit during growth and development, CGA contents in the flesh of the three peach cultivars ‘Ruiguang 18’, ‘Heiyoutao’, and ‘Beijingyixianhong’ were determined. The expression levels of CGA metabolism-related genes were analyzed based on transcriptome data (RNA-seq). These candidate genes were then screened and real-time fluorescent quantitative PCR (qRT-PCR) was performed to verify their expression. The results showed that the content of total CGAs, 5-O-caffeoylquinic acid and 3-O-caffeoylquinic acid, in the flesh of ‘Ruiguang 18’ exhibited a decreasing trend during fruit development, and there was a great drop at maturity stage (P < 0.05). The three contents in ‘Heiyoutao’ increased first at stage S2 (P < 0.05) and then decreased significantly (P < 0.05). In ‘Beijingyixianhong’, they stayed stable in the early stages, then total CGAs and 3-O-caffeoylquinic acid decreased significantly at the maturity stage (P < 0.05). RNA-seq transcriptome data analysis and qRT-PCR expression analysis showed that the accumulation of CGAs in fruit flesh was mainly affected by the expression of Prupe.3G100800 (PpHCT) and Prupe.3G107300 (Pp4CL), and their expression levels were highly consistent with total CGA content. Thus, we concluded that Prupe.3G100800 (PpHCT) and Prupe.3G107300 (Pp4CL) are the key genes for CGAs synthesis in peach flesh.
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