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Preparation of sub-micron colored particles by controlled emulsion polymerization
Haiyan Gao,안정호,김상효 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
Colored particles of poly(methyl methacrylate-co-ethylene glycol dimethacrylate) containing three different kinds of dye including Sudan black, Sudan red 7B and Oil blue N were made by emulsion polymerization. In an effort to find a way to prepare particles with size less than 100 nm with the maximized dye content, methanol is added either to the initial reaction media or during the polymerization. It was found that adding methanol is very efficient way to improve the dye incorporation efficiency while maintaining particle sizes less than 100 nm. By properly choosing methanol addition strategy, the dye content inside of particle could be increased up to four or five times and it was found that the optimum strategy of methanol addition is clearly depending on the nature of dye.
高海燕(Gao Haiyan) 중국어문학연구회 2008 중국어문학논집 Vol.0 No.53
Zhang Ailing's novels were rich in imagery, and the author was good at using imagery to make the overall atmosphere stand out and to express her thoughts and feelings. This paper analyzed the types, the art and the meaning of "death" imagery in her work, and thus the themes and modern values of Zhang Ailing's novels which were composed of these images were more profoundly embodied.
高海燕(Gao Haiyan) 중국어문학연구회 2007 중국어문학논집 Vol.0 No.47
Aural Test occupies 29.4% in the paper of HSK (Chinese Proficiency Test). The fact that students scored low in this part made it an urgent requirement to study corresponding teaching strategies to improve students' HSK listening comprehension ability. However, few study was on this topic. This paper mainly discussed three teaching strategies to help students to enhance their aural comprehension ability: 1. Help students overcome the psychological holdback in the Aural Test of HSK; 2. Introduce Language Theory and Language Learning Theory to students; 3. Teaching listening comprehension strategies to students and training them with the strategies.
( Haiyan Zhu ),( Zhiwu Chen ),( Zengchun Ma ),( Hongling Tan ),( Chengrong Xiao ),( Xianglin Tang ),( Boli Zhang ),( Yuguang Wang ),( Yue Gao ) 한국응용약물학회 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.6
Tanshinone IIA (Tan IIA) is a pharmacologically active substance extracted from the rhizome of Salvia miltiorrhiza Bunge (also known as the Chinese herb Danshen), and is widely used to treat atherosclerosis. The pregnane X receptor (PXR) is a nuclear receptor that is a key regulator of xenobiotic and endobiotic detoxification. Tan IIA is an efficacious PXR agonist that has a potential protective effect on endothelial injuries induced by xenobiotics and endobiotics via PXR activation. Previously numerous studies have demonstrated the possible effects of Tan IIA on human umbilical vein endothelial cells, but the further mechanism for its exerts the protective effect is not well established. To study the protective effects of Tan IIA against hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) in human umbilical vein endothelial cells (HUVECs), we pretreated cells with or without different concentrations of Tan IIA for 24 h, then exposed the cells to 400 μM H<sub>2</sub>O<sub>2</sub> for another 3 h. Therefore, our data strongly suggests that Tan IIA may lead to increased regeneration of glutathione (GSH) from the glutathione disulfide (GSSG) produced during the GSH peroxidase-catalyzed decomposition of H<sub>2</sub>O<sub>2</sub> in HUVECs, and the PXR plays a significant role in this process. Tan IIA may also exert protective effects against H<sub>2</sub>O<sub>2</sub>-induced apoptosis through the mitochondrial apoptosis pathway associated with the participation of PXR. Tan IIA protected HUVECs from inflammatory mediators triggered by H<sub>2</sub>O<sub>2</sub> via PXR activation. In conclusion, Tan IIA protected HUVECs against H<sub>2</sub>O<sub>2</sub>-induced cell injury through PXR-dependent mechanisms.
Tanshinone IIA Protects Endothelial Cells from H2O2-Induced Injuries via PXR Activation
Haiyan Zhu,Zhiwu Chen,Zengchun Ma,Hongling Tan,Chengrong Xiao,Xianglin Tang,Boli Zhang,Yuguang Wang,Yue Gao 한국응용약물학회 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.6
Tanshinone IIA (Tan IIA) is a pharmacologically active substance extracted from the rhizome of Salvia miltiorrhiza Bunge (also known as the Chinese herb Danshen), and is widely used to treat atherosclerosis. The pregnane X receptor (PXR) is a nuclear receptor that is a key regulator of xenobiotic and endobiotic detoxification. Tan IIA is an efficacious PXR agonist that has a potential protective effect on endothelial injuries induced by xenobiotics and endobiotics via PXR activation. Previously numerous studies have demonstrated the possible effects of Tan IIA on human umbilical vein endothelial cells, but the further mechanism for its exerts the protective effect is not well established. To study the protective effects of Tan IIA against hydrogen peroxide (H2O2) in human umbilical vein endothelial cells (HUVECs), we pretreated cells with or without different concentrations of Tan IIA for 24 h, then exposed the cells to 400 μM H2O2 for another 3 h. Therefore, our data strongly suggests that Tan IIA may lead to increased regeneration of glutathione (GSH) from the glutathione disulfide (GSSG) produced during the GSH peroxidase-catalyzed decomposition of H2O2 in HUVECs, and the PXR plays a significant role in this process. Tan IIA may also exert protective effects against H2O2-induced apoptosis through the mitochondrial apoptosis pathway associated with the participation of PXR. Tan IIA protected HUVECs from inflammatory mediators triggered by H2O2 via PXR activation. In conclusion, Tan IIA protected HUVECs against H2O2-induced cell injury through PXR-dependent mechanisms.
An investigation on the dynamics of domain switching of Bi0.5Na0.5TiO3-based ferroelectric ceramics
Zhipeng Gao,Hang Zhang,Yi Liu,Lingfeng Wu,Jia Yang,Tao Zhang,Haiyan Wang,Xuefeng Chen,Genshui Wang,Hongliang He 한국물리학회 2017 Current Applied Physics Vol.17 No.4
The dynamics of domain switching of Bi0.5Na0.5TiO3-based ferroelectric ceramic was investigated. With the electric field increasing, the domain switch experienced three sections of no domain switch region, creep region and flow region. In the creep region, the domain switch is dominated by the thermally activated domain wall movement. In flow region, the domain wall experience the viscous flow motion. For the BNT-BA-Zn ceramic, the activation energy of creep domain switch is much higher than it in flow region. With temperature increasing, the sensitivity of domain wall motion to the frequency is decreasing. This result demonstrated the domain switch of different ferroelectric materials could be quantitatively analyzed and compared based on the simple polarization - current - electric field data.
Zhu, Haiyan,Chen, Zhiwu,Ma, Zengchun,Tan, Hongling,Xiao, Chengrong,Tang, Xianglin,Zhang, Boli,Wang, Yuguang,Gao, Yue The Korean Society of Applied Pharmacology 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.6
Tanshinone IIA (Tan IIA) is a pharmacologically active substance extracted from the rhizome of Salvia miltiorrhiza Bunge (also known as the Chinese herb Danshen), and is widely used to treat atherosclerosis. The pregnane X receptor (PXR) is a nuclear receptor that is a key regulator of xenobiotic and endobiotic detoxification. Tan IIA is an efficacious PXR agonist that has a potential protective effect on endothelial injuries induced by xenobiotics and endobiotics via PXR activation. Previously numerous studies have demonstrated the possible effects of Tan IIA on human umbilical vein endothelial cells, but the further mechanism for its exerts the protective effect is not well established. To study the protective effects of Tan IIA against hydrogen peroxide ($H_2O_2$) in human umbilical vein endothelial cells (HUVECs), we pretreated cells with or without different concentrations of Tan IIA for 24 h, then exposed the cells to $400{\mu}M$ $H_2O_2$ for another 3 h. Therefore, our data strongly suggests that Tan IIA may lead to increased regeneration of glutathione (GSH) from the glutathione disulfide (GSSG) produced during the GSH peroxidase-catalyzed decomposition of $H_2O_2$ in HUVECs, and the PXR plays a significant role in this process. Tan IIA may also exert protective effects against $H_2O_2$-induced apoptosis through the mitochondrial apoptosis pathway associated with the participation of PXR. Tan IIA protected HUVECs from inflammatory mediators triggered by $H_2O_2$ via PXR activation. In conclusion, Tan IIA protected HUVECs against $H_2O_2$-induced cell injury through PXR-dependent mechanisms.
Solidification Structure Refining of 409L Ferritic Stainless Steel Using Fe-Ti-N Master Alloy
Chao Wang,Haiyan Gao,Yongbing Dai,Jun Wang,Baode Sun 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
A novel in-situ synthesized Fe-Ti-N master alloy was employed as a grain refiner for refining of the 409L ferritic stainless steel solidification structure. Two groups of experiments have been carried out to test the grain refinement performance of the Fe-Ti-N master alloy. In one group, 2 wt% of the Fe-Ti-N master alloy has been added into 409L ferritic stainless steel melts with various temperatures just before casting. In the other group, 409L ferritic stainless steel melts with 2 wt% Fe-Ti-N master alloy added at 1803K were held for various times before casting. It was found that high melt temperature resulted in a lower proportion of equiaxed grains and coarser structures. As the holding time increased, the proportion of the equiaxed grain zone decreased quickly. However, the proportion of the equiaxed grain zone re-increased when the holding time was extended longer than extreme points. The mechanisms of these experimental phenomena have been analyzed in terms of thermodynamics.