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CSA계 혼합 시멘트 수화에 미치는 Boric Acid 의 영향
유광석,이경희,김남호,이양수,안광훈,이재원,임굉,Yoo, K.S.,Lee, K.H.,Kim, N.H.,Lee, Y.S.,Hun, K.H.,Lee, J.W.,Yim, Going 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.6
C1A3계 속경성 혼합시멘트에 대한 H3BO3의 첨가에 따른 mortar의 물성과 수화 생성물에 관한 연구를 하였다. H3BO3의 첨가는 응결 시간의 지연과 흐름성의 개선을 가져 왔다. H3BO3의 첨가에 따라 초기 수화 생성물은 monosulfate가 생성 되며 이 생성물이 존재하는 기간도 길어진다. 일단 monosulfate가 생성되면 그후 ettringite로 변화되면서 중간 단계로 gel상의 물질로 변화된다. 초기에 생성되어지는 monosulfate는 mortar의 응결시간과 flow에 영향을 준다. The study was carried on the influence of {{{{ { {H }_{3 }BO }_{3 } }} for hydration of blended rapid hardening cement which was composed of {{{{ {{C }`_{4 } ^{ }A }_{3 } }} Adding {{{{ { {H }_{3 }BO }_{3 } }} to the mortar of blended rapid hardening cement delayed the setting time and increased the flow of the mortar. When {{{{ { {H }_{3 }BO }_{3 } }} added to the blended rapid hardening cement mono-sulfate was produced rather than ettringite and the existing time of monosulfate also prolonged. After hours monosulfate was converted to ettringite through being producted like gels. This monosulfate phase in-fluences on the setting time and flow of fresh mortar.
Microporous ZIF-7 membranes prepared by in-situ growth method for hydrogen separation
Go, Y.,Lee, J.H.,Shamsudin, I.K.,Kim, J.,Othman, M.R. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.24
<P>The H-2/CO2 selectivity across ZIF-7 membrane prepared by in-situ growth method at synthesis temperature and time of 105 degrees C and 2 h, respectively, was the highest at 15.98, nearly four times higher than H-2/CO2 Knudsen separation factor of 4.7. ZIF-7 membranes prepared from in-situ growth method also surprisingly performed better than ZIF-7 membranes prepared by other innovative techniques such as electro-spray deposition and secondary growth methods that achieved selectivity of 9.59 and 4.7, respectively. Despite lower selectivity performance than the numerically predicted results (the latter fall within the commercially attractive region with H-2/CO2 selectivity of 200 and permeability of 2000 barrer), the micro-porous ZIF-7 membrane prepared in this work demonstrated higher H-2 permeability of 3770 barrer. Performance comparison between various inorganic membranes, including ZIF-7 and ZIF-8 membranes (that are highly potential for commercial application with H-2/CO2 selectivity of 20.29 and permeability of 35541 barrer) was made and a new upper boundary for inorganic membranes was also constructed and reported. (C) 2015 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
Glycerol steam reforming over Ni–Fe–Ce/Al2O3 catalyst for hydrogen production
Go, G. S.,Lee, H. J.,Moon, D. J.,Kim, Y. C. Elsevier 2016 Research on chemical intermediates Vol.42 No.1
<P>In this study, we focused on the catalytic activity, stability, and kinetics of glycerol steam reforming (GSR) for the hydrogen production over Ni-Fe-Ce/Al2O3 catalyst. The GSR was investigated in a quartz fixed-bed reactor with an internal diameter of 6 mm under atmospheric pressure, 18.44-44.56 g h/mol weight of catalyst per molar flow rate of glycerol at the inlet (W (cat)/F (AO) ratio), 20 wt% glycerol solution concentration, and the temperature range 450-550 A degrees C. Ni-Fe-Ce/Al2O3 catalyst was characterized by N-2 physisorption [Brunauer-Emmett-Teller (BET) method], X-ray spectroscopy, temperature-programmed reduction with H-2, temperature-programmed desorption of adsorbed CO2 (CO2-TPD), scanning electron microscopy, and thermogravimetric analysis. H-2, CO2, CO and CH4 were the main gaseous products with the H-2:CO2 ratio at roughly 2.00. The increase in the temperature and W (cat)/F (AO) ratio caused the expected increase in the glycerol conversion and H-2 yield. All the kinetic parameters for the GSR were obtained in the kinetically controlled reaction regime. The experimental data using the power-law method indicate that the reaction order with respect to glycerol and the activation energy were 0.06 and 32.9 kJ/mol, respectively.</P>
Zhu, L. L.,Park, Y. J.,Gan, L.,Go, S. I.,Kim, H. N.,Kim, J. M.,Ko, J. W. Chapman and Hall 2017 Journal of materials science Materials in electron Vol. No.
<P>Highly transparent Y2O3 ceramics doped with different Zr concentrations were successfully fabricated by vacuum pre-sintering at temperatures ranging from 1600 to 1800 degrees C combined with a subsequent hot-isostatic pressing (HIP) treatment using commercial powders as the starting materials. All of the 1 mol% Zr-doped Y2O3 ceramics exhibit very good optical quality. The sample with the highest transparency level was realized by vacuum sintering at 1650 degrees C for 4 h followed by a post-HIP treatment at 1450 degrees C lasting 5 h. It has a fine microstructure and the grain size is 1.48 mu m. Furthermore, the in-line transmittance reaches 83.3% at 1100 nm (1.2 mm thickness). It was found that a relatively low vacuum sintering temperature (1650 degrees C) and relatively low Zr doping concentration (1 mol%) are more appropriate to achieve optimally transparent Y2O3 ceramics with a subsequent HIP treatment.</P>
Concerning the chromium precursor CrCl<sub>3</sub>(THF)<sub>3</sub>
Jeon, J.Y.,Park, J.H.,Park, D.S.,Park, S.Y.,Lee, C.S.,Go, M.J.,Lee, J.,Lee, B.Y. Elsevier 2014 INORGANIC CHEMISTRY COMMUNICATIONS Vol.44 No.-
The structure of some commercial sources of CrCl<SUB>3</SUB>(THF)<SUB>3</SUB> which might be prepared through dehydration of CrCl<SUB>3</SUB>.6H<SUB>2</SUB>O was discovered to be incorrect. Results of X-ray crystallographic studies showed that the correct structure was CrCl<SUB>3</SUB>(H<SUB>2</SUB>O)(THF)<SUB>2</SUB>. The use of this chromium precursor may have resulted in experimental failures, especially when strongly basic reagents that can deprotonate the coordinated water were reacted. CrCl<SUB>3</SUB>(THF)<SUB>3</SUB> prepared through Soxhlet extraction of anhydrous CrCl<SUB>3</SUB> using THF is the correct form of CrCl<SUB>3</SUB>(THF)<SUB>3</SUB>.
Nam, B.H.,Seo, J.K.,Go, H.J.,Lee, M.J.,Kim, Y.O.,Kim, D.G.,Lee, S.J.,Park, N.G. Academic Press 2012 Fish & Shellfish Immunology Vol.33 No.1
An approximately 21 kDa antimicrobial protein was purified from an acidified testis extract of olive flounder, Paralichthys olivaceus, by ion-exchange and C<SUB>18</SUB> reversed-phase HPLC. A comparison of the N-terminal amino acid sequence with those of other known antimicrobial polypeptides revealed high homology between this antimicrobial protein and other histone H1 molecules; thus, it was designated flounder histone H1-like protein (fH1LP). fH1LP showed potent antimicrobial activity against Gram-positive bacteria, including Bacillus subtilis, Staphylococcus aureus, and Streptococcus iniae (minimal effective concentrations [MECs], 2.8-30.0 μg/ml), Gram-negative bacteria, including Aeromonas hydrophila, Escherichia coli D31, Vibrio parahaemolyticus (MECs, 1.4-12.0 μg/ml), and Candida albicans (MEC, 2.0 μg/ml). cDNA cloning and tissue distribution studies of fH1LP indicated that it is constitutively expressed in testis and ovary. The fH1LP expression level was significantly dependent on developmental stage, and decreased dramatically after hatching. However, lipopolysaccharide stimulation did not induce fH1LP mRNA in other immune organs, including the kidney and spleen. These results suggest that fH1LP plays an important role in innate immunity in fish during reproduction, including mating, fertilization, and hatching.
한국 소재 대학교에 재학 중인 재외국민대학생의 문화지능과 학습참여도가 우울에 미치는 영향
강보미,강유빈,고미영,김찬송,남의정,박소은,박정연,백도윤,이혜린,한보혜,신주현,손지희 이화여자대학교 간호과학대학 2019 이화간호학회지 Vol.- No.53
Purpose: This study aims to identify the impact that cultural intelligence and learning engagement of Korean overseas students in Korea have in depression, also, to propose direction for further research, and to suggest a nursing intervention program that aims to the reduction of depression in overseas students. Methods:. The selected participants of the present study were Korean Overseas University Students enrolled in a special admission for overseas students. Data were obtained through the use of SPSS Window 25 and analyzed using descriptive statistics, t-test, ANOVA, Scheffe test, Pearsons correlation coefficient, and multiple linear regression analysis. Results: Depression in Korean overseas university students is influenced by the education system(ß=-.193, p=.046) and continent of residency(ß=0.197, p=.03). It is necessary to take into account the differences of education systems as well as the cultural differences from where they come from for the purpose of reducing depression rates in overseas Koreans. Conclusion: The results of this study show that depression in Korean overseas students is related to the differences in continents of residency and the education systems. Consequently, the development and implementation of a nursing intervention program considering both factors, the continent and education system, has become a necessity that relates to the reduction of depression in Korean overseas students.