http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Austenite Grain Growth Behavior of 30BF Steel Before Rough Rolling
Yong‑feng Chen,Jian‑bo Xie,Yan‑xin Wu,Jian‑xun Fu 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
To investigate the eff ect of heat treatment on the grain size of austenite in 30BF steel, the comparisons of the morphologiesand sizes of austenite grains between heating samples were made with a high-temperature electric resistance furnace, andthe austenite growth models were built with method of mathematics. The results show that most grains in original specimenwith the sizes below 70 μm uniformly distributed. At a heating rate ( v ) of 10 °C/s, the grain size ( d ) value under a certain time( t ) increased by 60–100 μm with raising temperature ( T ) from 850 to 1100 °C, whereas the d value under a certain T merelyincreased by 70–120 μm with raising time to 60 min. Under v = 0.1 °C/s, T = 850 °C, and t = 0 s, the occupied ratio of grainswith sizes of 40–50 μm was 0.165, whereas at 900 °C, the occupied ratio was 0.125. The evolutions of ln (d5.8− d5.80 ) with1/ T were in negative linear correlations, whereas the ln (d5.8− d5.80 ) with ln t were in positive linear correlations. To sum up,the grain growth behavior of steel was elucidated.
Jian-ping Yong,Haji Akber Aisa 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
To improve the biological activities of rupestonic acid, 21 new rupestonic acid fatty ester derivatives (2a-2h)and aromatic ester derivatives (2i-2u) were synthesized and preliminarily evaluated for their anti-influenza activity in vitro by the national center for drug screening of China, using the Oseltamivir and Ribavirin as reference drugs. The results showed that 2l (IC_50 = 0.5 μmol/L) exhibited potent anti-influenza A_3 viral activity among the synthesized compounds and was 10-fold more potent than that of the reference drug Oseltamivir (IC_50 = 5.1 μmol/L).
Optimization of preparation and properties of Gardenia yellow pigment-loaded alginate beads
Yong Liu,Qing Zhou,Yan-Mei He,Xiu-Yun Ma,Lin-Na Liu,Yong-Jian Ke 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8
Gardenia yellow pigment (GYP) loaded alginate beads were prepared by the ionic gelation technique, and the preparation parameters were optimized by response surface methodology for high encapsulation efficiency. The optimized parameters were alginate concentration of 3.3%, CaCl2 concentration of 2.4%, and GYP concentration of 3.2mg/mL, under which the encapsulation efficiency was 73.61%. The surface morphology and bead size analysis showed that the GYP-loaded alginate beads had a roughly spherical morphology with a wrinkled surface, and their average diameter was 0.87 mm. In vitro release test revealed that the GYP release had a pH-dependent release profile and a two-step release process. The Rigter-Peppas model was the most proper model to assess the GYP release from alginate beads. The release mechanism of GYP at pH 1.2 and 7.4 was non-Fickian transport and case-II transport, respectively. The 2,2-diphenyl-1-picrylhydrazyl assay indicated that the encapsulated GYP had effectively maintained 82.56% of the antioxidant activity.
Jian Liu,Gui-jie Yang,Yong Li,Hong-wei Gao,Jian-yong Su 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
To insure stable operation and eliminate twice torque ripple, a topology for a six phase permanent magnet synchronous generator (SP-PMSG) with a neutral point connected together was analyzed in this paper. By adopting an extended transformation matrix, the mathematic model of the space vector control was established. The voltage and torque equations were deduced while considering the third harmonic flux and inductance. In addition, the suppression third harmonic method and the closed loop control strategy were proposed. A comparison analysis indicates that the cooper loss minimum method and the current magnitude minimum method can meet different application requirements. The voltage compensation amount for each of the methods was deduced which also takes into account the third harmonic effect. A simulation and experimental result comparison validates the consistency through theoretical derivation. It can be seen that all of the two control strategies can meet the requirements of post-fault.
The characteristics of genistin-induced inhibitory effects on intestinal motility
Yong-jian Xiong,Da-peng Chen,Bo-chao Lv,Fang-fei Liu,Li Wang,Yuan Lin 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.3
Genistin belongs to isoflavones. Based on thefacts that genistin exerts inhibitory effects on the contractilityof vascular smooth muscle,the present study wasdesigned to characterize the effects of genistin on intestinalcontractility and evaluate its potential clinical implication. Ex vivo [isolated jejunal segment (IJS) of rat], in vitro, andin vivo assays were used in the study. The results indicatedthat genistin (5–80 lmol/L) inhibited the contraction of IJSin a dose-dependent manner and inhibited the increasedcontractilityof IJS induced by acetylcholine (ACh), histamine,high Ca2?, and erythromycin, respectively. Theinhibitory effects of genistin were correlated with thestimulation of alpha adrenergic and beta adrenergicreceptors since these inhibitory effects were significantlyblocked in the presence of phentolamine and propranololrespectively. No further inhibitory effects of genistin wereobserved in the presence of verapamil or in Ca2?-freecondition, indicating genistin-induced inhibitory effects areCa2?-dependent. Genistin decreased myosin light chainkinase (MLCK) protein contents and MLCK mRNAexpression in IJS, and inhibited both phosphorylation andMg2?-ATPase activity of purified myosin, implicating thatthe decrease of MLCK contents and inhibition of MLCKactivity are involved in the genistin-induced inhibitoryeffects. The study suggests the potential clinical implicationsof genistin in relieving intestinal hypercontractility.
Jian-ping Yong,Qiao-ying Lv,Haji Akber Aisa 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.2
19 Aromatic ring and L-amino acid ester contained rupestonic acid amide derivatives 2a~2l, 3a~3g were synthesized and preliminarily evaluated in vitro against influenza virus A3,B and herpes simplex virus type 1 (HSV-1), 2(HSV-2) by the national center for drug screening of China. The rusults showed that 2i possessed the highest inhibition against both influenza virus A3 (TC50 = 120.6 μmol/L, IC50 = 19.2 μmol/L, SI = 6.3) and B (TC50 = 120.6 μmol/L, IC50 = 29.9 μmol/L, SI = 4.0); 2g was more active against influenza A3 virus at very low cytotoxicity (TC50 > 2092.1 μmol/L, IC50 = 143.7 μmol/L, SI > 14.6) than the parent compound; Compounds 2b, 2c, 2f showed higher activities both against HSV-1 and HSV-2 than that of the parent compound, and 2f was the most potent inhibitor of HSV-1 (TC50 = 200.0 μmol/L, IC50 = 11.3 μmol/L, SI = 17.7 ) and HSV-2 (TC50 = 200.0 μmol/L, IC50 = 20.7 μmol/L , SI = 9.7).
Yong, Jian-Ping,Aisa, Haji Akber Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
To improve the biological activities of rupestonic acid, 21 new rupestonic acid fatty ester derivatives (2a-2h) and aromatic ester derivatives (2i-2u) were synthesized and preliminarily evaluated for their anti-influenza activity in vitro by the national center for drug screening of China, using the Oseltamivir and Ribavirin as reference drugs. The results showed that 2l ($IC_{50}=0.5{\mu}mol/L$) exhibited potent anti-influenza $A_3$ viral activity among the synthesized compounds and was 10-fold more potent than that of the reference drug Oseltamivir ($IC_{50}=5.1{\mu}mol/L$).
Jian-Feng Chen,Ming-Qi Chen,Yong-Kang Shen,Jian-Hua Shao,Xin-Xin Yang 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.3
In this paper, the axial compressive properties of cold-formed steel lipped channel stub columns strengthened by rebars or steel strips are experimentally studied. The experiment included two sections. A kind of columns with local buckling is reinforced longitudinally by steel strips at the web. The other is the columns with distorted buckling, which is reinforced longitudinally by steel bars at the curling edge. The failure mode, deformation characteristics, ultimate bearing capacity and load displacement curve of the specimen are obtained through the experiment. On the basis of the experiment, the calculation results of theoretical axial bearing capacity of cold-formed steel lipped channel stub columns in Chinese, North American and Australian code are compared and analyzed. Research indicates: First, the cold-formed steel lipped channel stub columns strengthened by steel bars or steel strips can effectively improve the compressive bearing capacity of the specimen. Secondly, when the initial stress ratio of specimen is less than 0.3, the reinforcement effect is ideal. Thirdly, the three standards don’t stipulate the calculation of theoretical bearing capacity of the specimen strengthened after loading, so there is a large deviation between the theoretical calculation value and the test value.