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Youn, J.S.,No, K.,Kim, Y.H.,Mahmood, A.,Jun, B.H.,Han, Y.H.,Sung, T.H.,Kim, C.J. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
To understand the effect of BaCeO<SUB>3</SUB> on a Y<SUB>2</SUB>BaCuO<SUB>5</SUB> (Y211) distribution, Y<SUB>1.5</SUB>Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>x</SUB> (Y1.5) superconductors with/without 1wt.% BaCeO<SUB>3</SUB> additions were prepared by a top-seeded melt-textured growth (TSMG) process. Two different BaCeO<SUB>3</SUB> powders (as-synthesized (coarse powder) and an attrition-milled (fine powder)) were used and the size effect was compared with that obtained from a Y1.5 sample with no addition. A refinement of the Y211 particles was achieved for both the as-synthesized and attrition-milled BaCeO<SUB>3</SUB> additions. The distribution of the Y211 particles was most uniform in the Y1.5 sample prepared with the attrition-milled BaCeO<SUB>3</SUB> powder due to the reduced size of the Y211-free regions by the fine size BaCeO<SUB>3</SUB> addition. The highest J<SUB>c</SUB> was achieved in the Y1.5 sample prepared with the attrition-milled BaCeO<SUB>3</SUB> powder. The J<SUB>c</SUB> result agreed well with the microstructure variations by the addition of BaCeO<SUB>3</SUB> powders.
Choi, J.S.,Park, S.D.,Jun, B.H.,Han, Y.H.,Sung, T.H.,Choo, K.N.,Kim, C.J. The Korean Society of Superconductivity and Cryoge 2009 한국초전도저온공학회논문지 Vol.11 No.2
Effects of $BaCO_3$ purity on the superconducting properties of top seeded melt growth (TSMG) processed $Y_{1+x}Ba_2Cu_3O_{7-y}$ (Y1+x, x=0.1 and 0.2) superconductors were investigated. $YBa_2Cu_3O_{7-y}$ (Y123) powder prepared using $BaCO_3$ with 99.75% purity and commercially available Y123 powder of 99.9% were used for the fabrication of single Y123 grain superconductors. $T_c$ values of the Y1+x samples prepared using low purity Y123 powder were slightly lower than those of the samples prepared using a high purity powder. In addition to the lower $T_c$, an anomalous peak effect in the intermediate magnetic fields was observed in Y1+x samples prepared using the low purity $BaCO_3$ powder. The slight decrease in $T_c$ and the anomalous peak effect are ascribed to the possible incorporation of a Y123 phase with impurity elements such as strontium and calcium included in the $BaCO_3$powder of 99.7%. The result suggests that the low purity $BaCO_3$ powder of a low price can be used as a raw power for the fabrication of single grain YBCO bulk superconductors.
Han S. Uhm,Kyung H. Lee,Soon C. Cho,Sung Y. Jo,Chan U. Bang,Dong K. Lee 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Surface treatments of Y2O3:Eu phosphors for improving the hydrophobic property were carried out using plasmas generated from a O-(Si(CH3)3)2 (HMDSO) in a low-pressure environment. The super-hydrophobic properties of the treated Y2O3:Eu phosphors were investigated. The samples treated by using the HMDSO/toluene glow plasma were analyzed by FTIR and OES and analyzed in terms of their contact angles (CAs). The effects of the HMDSO/toluene plasma treatments on the Y2O3:Eu phosphors were investigated in terms of the total surface free energy by using probe liquids to measure their contact angles (CAs). The total surface free energy of the Y2O3:Eu phosphors before and after a surface treatment with the HMDSO/toluene plasma, as estimated via the Owens-Wendt equation, was found to decrease from 82.2 mJ/m2 to 0.021 mJ/m2. This represents a significant improvement of the hydrophobicity of the Y2O3:Eu phosphors after the plasma treatment.
Mahmood, A.,Park, S.D.,Jun, B.H.,Youn, J.S.,Han, Y.H.,Sung, T.H.,Kim, C.J. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
Single grain YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-x</SUB> (Y123) bulk superconductors with Y<SUB>2</SUB>BaCuO<SUB>5</SUB> (Y211) and various amounts of BaCeO<SUB>3</SUB> (5-45wt.% by an increment of 10wt.%) were fabricated by a seeded infiltration process. The addition of BaCeO<SUB>3</SUB> was found to be effective for a modification of the microstructure and an improvement of the superconducting properties. The refinement effect for Y211 particles within an entire superconducting YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-x</SUB> (Y123) matrix was achieved by BaCeO<SUB>3</SUB> additions. The critical current density (J<SUB>c</SUB>) values were increased as the BaCeO<SUB>3</SUB> contents were increased (maximum J<SUB>c</SUB> at 35wt.% BaCeO<SUB>3</SUB> addition). The J<SUB>c</SUB> improvement by BaCeO<SUB>3</SUB> additions might be due to the microstructure modifications associated with the finely distributed Y211 and BaCeO<SUB>3</SUB> particles. With the addition of BaCeO<SUB>3</SUB> the onset T<SUB>c</SUB> values decreased slightly, indicating highly limited Ce substitution for Y site. It can be concluded that the BaCeO<SUB>3</SUB> addition has a beneficial effect on the morphology, the size and the distribution of the Y211 inclusions and the microstructure regarding pinning improvement.
Kim, YA Cho;Park, K-S;Lim, S-Y;Shin, A;Sung, M-K;Ro, J Sookmyung Women's University Research Institute of 2011 여성과 건강 Vol.6 No.2
Background: Although high soy consumption may be associated with lower breast cancer risk in Asian populations, findings from epidemiological studies have been inconsistent. Objective: We investigated the effects of soy intake on breast cancer risk among Korean women according to their menopausal and hormone receptor status. Methods: We conducted a case-control study with 358 incident breast cancer patients and 360 age-matched controls with no history of malignant neoplasm. Dietary consumption of soy products was examined using a 103-item food frequency questionnaire. Results: The estimated mean intakes of total soy and isoflavones from this study population were 76.5 g per day and 15.0 mg per day, respectively. Using a multivariate logistic regression model, we found a significant inverse association between soy intake and breast cancer risk, with a dose-response relationship (odds ratios (OR) (95% confidence interval (Cl)) for the highest vs the lowest intake quartile: 0.36 (0.20-0.64)). When the data were stratified by menopausal status, the protective effect was observed only among postmenopausal women (OR (95% Cl) for the highest vs the lowest intake quartile: 0.08 (0.03-0.22)). The association between soy and breast cancer risk did not differ according to estrogen receptor (ER)/progesterone receptor (PR) status, but the estimated intake of soy isoflavones showed an inverse association only among postmenopausal women with ER + /PR+ tumors. Conclusions: Our findings suggest that high consumption of soy might be related to lower risk of breast cancer and that the effect of soy intake could vary depending on several factors.
정병길,김대용,최수한,김용윤,성낙창 동아대학교 환경문제연구소 2006 硏究報告 Vol.28 No.1
The objective of this study have been carried out to investigate the solubilization and optimum operation of waste activated sludge by laser for sewage sludge reduction. The concentration of waste activated sludge was adjusted to 0.4%, 0.6%, 0.8%, 1.0%, 1.5% of total solids, respectively. Laser modules were used for pretreatment of waste activated sludge out to use laser module(wavelength : 635~650nm, powermax : <5mW, operating electric power : 6V) in the laser pretreatment. Waste activated sludge was evaluated the temperature, pH, SCOD, SCOD/TCOD rate for the 24 hours. The results showed that SCOD/TCOD rates were increased at the low concentration of total solids, because permeability characteristics of laser were largely interrupted by medium in the sludge. The SCOD/TCOD rates were gradually increased until 1hr of irradiation. At the 0.4% of TS concentration, SCOD/TCOD rates were most effective by increasing sludge temperature from 20.0℃ to 26.3℃, decreased pH from 7.1 to 6.5 and increased concentration of SCOD from 58mg/L to 85mg/L.
유형별 완전혼합사료 급여가 반추위내의 발효성상 및 영양소 소화율에 미치는 영향
이덕윤,고종렬,최낙진,이상석,송재용,이세영,박성호,성하균,하종규 한국동물자원과학회 2003 한국축산학회지 Vol.45 No.5
This study was conducted to examine effects of feeding dry TMR(DTMR), wet TMR(WTMR) and fermented TMR(FTMR) on rumen fermentation, enzyme activity and digestibility in the total tract of sheep. Three rumen cannulated sheep were used in a 3 × 3 latin square design. The present results showed that ?, NH_(3)-N, total and individual VFA, A/P ratio and enzymes (CMCase, Xylanase and Protease) activity in the rumen were higher in WTMR and FTMR compared with DTMR. In addition, dry matter, organic matter, crude protein, ether extract, NDF and ADF digestibility in the total tract were also higher in WTMR and FTMR compared with DTMR. Therefore, the present results showed that WTMR and FTMr are better than DTMR for rumen fermentation and nutrients digestibility.
Kim, Youngha,Kim, C-J,Jun, B-H,Sung, T H,Han, Y H,Han, S C,No, Kwangsoo IOP Publishing Ltd 2009 Superconductor science & technology Vol.22 No.6
<P>The influence of nanosized secondary particles, such as those produced via rare-earth doping for example, on magnetic-field-induced flux motion in YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−δ</SUB> (YBCO)-coated conductors has been investigated. In this study, we investigated the influence of Ce doping on nanosized secondary phase formation in YBCO films. Ce-doped YBCO films on single SrTiO<SUB>3</SUB> crystals were prepared via metal–organic chemical vapor deposition (MOCVD). For the first time, a Y<SUB>2</SUB>BaCuO<SUB>5</SUB> (Y211) secondary phase was observed in the Ce-doped YBCO film, while the pure YBCO film contained only a Y<SUB>2</SUB>O<SUB>3</SUB> secondary phase. As Ce doping concentration increased to 3 wt%, a BaCeO<SUB>3</SUB> secondary phase developed. This was due to the low solubility limit of Ce for Y in the MOCVD YBCO film. Additionally, outgrowths on the Ce-doped YBCO film surfaces and defect structures, such as <I>a</I>-axis grains, were examined.</P>