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EIGENVALUE PROBLEM OF BIHARMONIC EQUATION WITH HARDY POTENTIAL
Yangxin Yao,Shaotong He,Qingtang Su 대한수학회 2010 대한수학회지 Vol.47 No.6
In this paper, we consider the eigenvalue problem of biharmonic equation with Hardy potential. We improve the results of references by introducing a new Hilbert space. In this paper, we consider the eigenvalue problem of biharmonic equation with Hardy potential. We improve the results of references by introducing a new Hilbert space.
Hanju Sun,Shaotong Jiang,Mingyang Zi,Ding Qi 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.6
Crude polysaccharides from rapeseed meal (PRM) were extracted with 0.3% NaOH aqueous solution, followed by further purifications and 2 fractions, namely PRM1 and PRM2, were separated with a DEAE-cellulose DE-52 column. Their primary compositions were analysed and antioxidant activity was determined, including scavenging activity toward superoxide anion radicals, hydroxyl radicals, and nitric oxide radicals, reducing power, and inhibitory effects against the microsomal lipid peroxidation, compared to that of L-ascorbic acid. The results indicated that PRM1 and PRM2 exhibited not only good reducing power and inhibitory effects on the microsomal lipid peroxidation, but also strong scavenging activity toward superoxide anion radicals, nitric oxide radicals, and hydroxyl radicals. In addition, positive correlations were also observed between the superoxide anion radical scavenging activity and the protein contents of the polysaccharides, and the reducing power and the sulfate contents. These findings thus clearly suggest the polysaccharides possess direct and potent antioxidant activity.
EIGENVALUE PROBLEM OF BIHARMONIC EQUATION WITH HARDY POTENTIAL
Yao, Yangxin,He, Shaotong,Su, Qingtang Korean Mathematical Society 2010 대한수학회지 Vol.47 No.6
In this paper, we consider the eigenvalue problem of biharmonic equation with Hardy potential. We improve the results of references by introducing a new Hilbert space.
Dark Field Digital Holographic Microscopy Based on Two-lens 360-degree Oblique Illumination
Xiuying Zhang,Yingchun Zhao,Caojin Yuan,Shaotong Feng,Lin Wang 한국광학회 2020 Current Optics and Photonics Vol.4 No.3
In this paper we propose a dark-field digital holographic microscopy system based on 360-degree oblique illumination. This setup is constructed without using a dark-field objective. The principle of 360-degree oblique illumination of vortex beam and dark-field digital holographic microscopy are introduced theoretically and experimentally. By analyzing the reconstructed image of a dark-field digital hologram of a USAF 1951 target, it is proved that the imaging resolution can be improved by this method. And also, comparison and analysis are made on the reconstructed image of a bright-dark field digital hologram of a pumpkin stem slice, the result shows that the imaging contrast is also enhanced with this method, and it is effective for dark-field digital holographic microscopy imaging of large transparent biological samples.
Zhu Jun,Nan Huaichun,Guo Xiangwei,Liu Penghui,Du Shaotong,Yang Ming 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
This paper designs a new MW-scale half direct-driven axial flux permanent magnet generator (HDDAFPMG), which incorporates the merits of compact structure and high power density.In order to improve the output voltage quality of the generator,a multi-objective optimization method of parameter hierarchical optimization mechanism and NSGA-II is used to optimize the key design parameters of the generator.By comparing the performance of initial and optimization model using Finite Element Method (FEM), it is found that the output voltage quality of the optimization model is significantly improved.In addition,the Halbach permanent magnet (PM) array is used to decrease the total harmonic distortion (THD) of voltage waveform and decrease the thickness of back iron.It is concluded that the generator with 60° magnetized Halbach PM array can decrease the THD of voltage waveform decreases from 2.27% to 0.46% and decrease the thickness of back iron from 36 mm to 15 mm, which is reduced by 58.33%.
Xingjiang Li,Ya Liu,Ying Yang,Hua Zhang,Hualin Wang,Yue Wu,Min Zhang,Ting Sun,Jieshun Cheng,Xuefeng Wu,Lijun Pan,Shaotong Jiang,Hongwei Wu 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.3
The microbial fermentation of malic acid,which is one of the most important organic acid platformsused widely in food and chemical engineering, hasattracted considerable interest. A malate production strainwas isolated, a mutation was induced, and regulation of themetabolic network was then conducted. The identificationresults showed that the malic acid production strain, HF-119, belonged to Rhizopus delemar. An analysis of themetabolic pathway showed that the malic acid flux of thisstrain occurred through three main pathways, and manybyproducts, such as succinic acid, fumaric acid andethanol, were produced. Although corn straw hydrolytewas used, the metabolism of xylose was not as rapid as thatof glucose. Subsequently, breeding of the strains andregulation of the metabolic network resulted in an increasein malate yield, and the strain HF-121 produced more than120 g/L malic acid within 60 h. The ability to producemalic acid from biomass hydrolyte highlights the industrialdevelopment potential of this strain.