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Oxidation behavior of YAG-ZrB2 ceramics prepared by spark plasma sintering
Jie-Guang Song,Da-Ming Du,Yin-Yan Ju,Yang-Liang Li,Shi-Bin Li,Gang-Chang Ji 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4
ZrB2 and YAG are widely applied because of some excellent properties, but ZrB2 is easily oxidized in high-temperature air. To make ZrB2 ceramics have better oxidation resistance, high-density YAG-ZrB2 ceramics were prepared. The oxidation behavior of YAG-ZrB2 ceramics is investigated at different temperatures. The results indicate that the enhanced weight change differs according to the temperature range, slightly in the temperature 900-1000oC, sharply from 1100-1300 and smoothly above 1300oC. The weight change rate of YAG-ZrB2 ceramics is increased by prolonging the oxidation time, but the weight change rate of YAG-ZrB2 ceramics is gradually reduced. The oxidation layer is porous as compared to the YAG-ZrB2 ceramics layer.
( Da Lei Yao ),( Chang Hao Zhang ),( Jie Luo ),( Mei Jin ),( Ming Shan Zheng ),( Jiong Mo Cui ),( Jong Keun Son ),( Gao Li ) 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
Two new (1 and 3) two known diarylhep-tanoids (2 and 4), along with two tetralones (5 and 6), one naphthoquinone (7), four phenylpropanoids (8-11), and phenol (12) were isolated from the leaves of Juglans mandshurica. Their structures were elucidated on the basis of spectral and chemical data. Compounds 2 and 10 are firstly isolated from this plant and 8 and 12 were isolated from the Juglans genus for the first time. Among these compounds, only 7 cxhibitcd moderate cytotoxicities against cultured Mgc-803, A549, K562, and Hela tumor cell lines with IC50 values of 25.90, 28.60, 39.06, 44.90 LLM, respectively.
Chemical constituents from the leaves of Juglans mandshurica
Da Lei Yao,Chang Hao Zhang,Jie Luo,Mei Jin,Ming Shan Zheng,Jiong Mo Cui,손종근,Gao Li 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.4
Two new (1 and 3) and two known diarylheptanoids(2 and 4), along with two tetralones (5 and 6), onenaphthoquinone (7), four phenylpropanoids (8–11), andone phenol (12) were isolated from the leaves of Juglansmandshurica. Their structures were elucidated on the basisof spectral and chemical data. Compounds 2 and 10 arefirstly isolated from this plant and 8 and 12 were isolatedfrom the Juglans genus for the first time. Among thesecompounds, only 7 exhibited moderate cytotoxicitiesagainst cultured MGC-803, A549, K562, and HeLa tumorcell lines with IC50 values of 25.90, 28.60, 39.06,44.90 lM, respectively.
Chemical constituents from the aerial parts of Melandrium firmum
Chang Hao Zhang,Gao Li,Jie Luo,Tian Li,Yong Cui,Mei Jin,Da Lei Yao,Ming Shan Zheng,Zhen-Hua Lin,Jiong Mo Cui 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.10
Two new anthraquinones, melrubiellin C (1) andmelrubiellin D (2), were isolated from the aerial parts of Melandriumfirmum Rohrbach, together with eight known compounds(3–10). The structures of these compounds wereelucidated using 1Dand 2DNMR(COSY,HMQC,HMBCandNOESY) experiments. All isolated compounds were tested fortheir cytotoxicity against NCI-H460, Hep G2, MKN-28 andA-549 cells.Of these 10 compounds,1 and 2 exhibitedmoderatecytotoxicity with IC50 values ranging from 9.54 to 32.41 lM.
Cytotoxic anthraquinone dimers from Melandrium firmum
Chang Hao Zhang,Da Lei Yao,Cheng-Shen Li,Jie Luo,Mei Jin,Ming-Shan Zheng,Zhen-Hua Lin,Tie-Feng Jin,Gao Li 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.6
Two new anthraquinone dimers, melrubiellin A(1) and melrubiellin B (2), were isolated from the aerialpart of Melandrium firmum Rohrbach, along with sevenknown compounds (3–9). The structures of these compoundswere elucidated by spectral analyses, including 1Dand 2D NMR (COSY, HMQC, HMBC and NOESY)experiments. Compound 1 and 2 exhibited significantcytotoxicity towards HeLa, NCI-H460, Hep G2, Hep 3Band MKN-28 cell lines with IC50 values ranging from 5.26to 81.16 lM.
Screening for MiRNAs Related to Laryngeal Squamous Carcinoma Stem Cell Radiation
Huang, Chang-Xin,Zhu, Ying,Duan, Guang-Liang,Yao, Ji-Fen,Li, Zhao-Yang,Li, Da,Wang, Qing-Qing Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8
Objective: To use microarray chip technology for screening of stem cell radiation related miRNAs in laryngeal squamous cell carcinoma; study and explore the relationship of miRNAs with radiosensitivity of laryngeal squamous cells. Method: After conventional culture and amplification of the laryngeal squamous carcinoma cell line Hep-2, CD 133+ cells were screened out with combination of isolated culture of stem cell microspheres and FACS for preparation of laryngeal cancer stem cells. After radiation treatment, miRNAs of laryngeal squamous carcinoma stem cells before and after radiation were enriched and purified. After microarray hybridization with mammalian miRNA and scanning of fluorescence signal, the miRNAs of laryngeal squamous carcinoma stem cells before and after radiation was subject to differential screening and clustering analysis. Real-time quantitative RT-PCR was used to verify part of the differentially expressed miRNAs. Results: 70 miRNAs related to laryngeal cancer stem cell radiation with 2-fold difference in expression were screened out, in which 62 were down-regulated and 8 were up-regulated. Fluorescent quantitative RT-PCR results were consistent with miRNAs chip results. Conclusion: Some miRNAs may be involved in self-regulation with laryngeal squamous carcinoma stem cell radiation.
( Yao Da Lei ),( Zhang Chang Hao ),( Li Ren ),( Luo Jie ),( Jin Mei ),( Piao Jin Hua ),( Zheng Ming Shan ),( Cui Jiong Mo ),( Son Jong Keun ),( Li Gao ) 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
The present study was designed to isolate and characterize novel chemical constituents of the stem bark of Juglans mandshurica Maxim. (Juglandaceae).The chemical constituents were isolated and purified by various chromatographic techniques. The structures of the compounds were elucidated on the basis of spectral data (1D and 2D NMR, HR-ESI-MS, CD, UV, and IR) and by the comparisons of spectroscopic data with the reported values in the literatures. Two long chain polyunsaturated fatty acids (1 and 2) were obtained and identified as (S)-(8E, 10E)-12-hydroxy-7-oxo-8, 10-octadecadienoic acid (1) and (S)-(8E, 10E)-12-hydroxy-7-oxo-8,10-octadecadienoic acid methyl ester (2). To the best of our knowledge, this is the first report on the isolation and structural elucidation of the two new conjugated ketonic fatty acids from this genus.
Jian Li,Da-Woon Choi,Chang-Hum Cho,Dae-Hyun Koo,Yun-Hyun Cho IEEE 2011 IEEE transactions on magnetics Vol.47 No.10
<P>This paper investigates eddy-current in an axial flux permanent magnet (AFPM) machine, which consist of the segmented stator teeth and concentrated winding, with one inner rotor and double stators. Analytical methods was developed to calculate the eddy-current loss of PMs and other solid components, including effect of winding harmonics and permeance variation due to slot opening. Eddy-current losses were analyzed by time-stepping three dimensional finite element analysis (3D FEA) in two rotor models, when magnets are insulated or noninsulated. A prototype machine was manufactured based on analysis results, and was tested as a generator. It is found that rotor stainless PM holder should be used in order to reduce eddy-currents and insulation of PMs further reduces eddy-current losses.</P>
Geometrical and Magnetic Properties of Vanadium Clusters Supported on Graphene
Yu Zou,Chang Yong Zhan,Jian-Chun Wu,Li-Ping Zhou,Hai-Xia Da 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.2
We report ab-initio calculations of vanadium-cluster Vn(n = 2−5) adsorption on graphene sheets. Geometrical and magnetic properties of various adsorption configurations are studied using firstprinciples density-functional theory with the generalized gradient approximation. The geometrical and magnetic properties of vanadium clusters are found to be size-dependent, and the supported graphene sheet could influence the formation of the vanadium clusters. Low-dimensional Vn cluster configurations could be easily formed when they are absorbed on a graphene sheet, and the combined Vn-graphene systems exhibit a nonmagnetic state, which is the most stable magnetic configuration. Our calculations for the geometrical and the magnetic moment properties of Vn-graphene systems may be of interest for some nanotechnological applications.