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Enhancement of CH4-water mass transfer using methyl-modified mesoporous silica nanoparticles
Sung-Yeob Lee,Kyo-Sung Mo,최진하,허남회,오병근,이진원 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.9
Surface-modified mesoporous silica nanoparticle (MSN) with methyl groups was used to enhance the CH4-water volumetric mass transfer coefficient (kLa) and the solubility of CH4 in water. Two types of samples were tested: unmodified MSN and methyl-modified MSN. The mass transfer for each type of sample was measured every 20 s by gas chromatography. The results showed that the methyl-modified MSN, which have both hydrophobic and hydrophilic properties on the surface, exhibited higher CH4-water volumetric mass transfer coefficient and solubility in water. The dissolved concentrations of CH4 were enhanced by 10.7% and 27.8%, and the volumetric mass transfer coefficient were enhanced by 28.6% and 84.7%, respectively, by using unmodified MSN and methyl-modified MSN.
고 Cr-Mo 강의 수정멱수법칙을 이용한 W.M 크리프 수명예측
안종교(Jong Kyo An),양성모(Sung Mo Yang),유효선(Hyo Sun Yu),강희용(Hee Yong Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The high temperature creep properties of the generating plant's high temperature tube, pipe and header and such are very significant in accordance with long-time exposure to the high temperature and pressure environment. Not only this, but as the welding procedure is compulsory for the cohesion of components, the creep properties regarding the local microstructures of steel weldment are very important. In order to understand the creep properties regarding the local microstructures of steel weldment, the SP-Creep test which is easy to get sample from the field component was conducted. The local microstructure of steel weldment, that is, W.M and B.M's microstructures were observed using the SEM. The rupture time of WM was longer as 110% averagely in a same condition, which is the consequence of the difference of the microstructure. Each lethargy coefficient ofB.M and WM is evaluated by the relation among the temperature, load and the rupture time from SP-Creep Test. The life estimation equation can be induced by the transformation of Power-law. B.M and WM for each 550℃ and 575℃, the very similar to normal temperature of the domestic thermal power generation in working, are estimated.
박교선(Kyo Sun Park),윤해근(Hae Keun Yun),서흥수(Heung Soo Suh),정상복(Sang Bouk Jeong),조현모(Hyun Mo Cho) 한국원예학회 2004 원예과학기술지 Vol.22 No.4
고품질이며 내병성과 내한성인 생력재배형 포도 품종을 육성하고자 원예연구소에서 1981년 ‘Campbell Early’ 품종에 ‘Himrod Seedless’ 품종을 교배하였다. 수원지방에서 발아기는 4월 22일, 만개기는 6월 4일이며 숙기는 9월 7일로 ‘Campbell Early’와 유사하였다. 과립은 7.5g으로 대립이고 당도는 17.2%이며 산도는 0.39%로 낮아 고당저산으로 식미가 우수하였다. 과방형은 원추형, 과립은 원형, 과피색은 자흑색, 과분과 과즙은 많았다. 착립밀도가 중밀로 과립이 적당히 밀착되어 알솎기 작업이 필요치 않았으며 과다착립에 따른 열과현상도 적었다. 내한성은 강한 편이었으나 중부이북지역에서는 겨울철 월동대책이 필요하고 내병성은 전반적으로 강하였다. ‘Tamnara’ was originated from the cross between ‘Campbell Early’ (Vitis labruscana) and ‘Himrod Seedless’ (Vitis sp.) in grape breeding program for disease resistance and cold hardness by NHRI in 1981. ‘Tamnara’ had a budburst on 22 April, flowering on 4 June, and ripening on 7 September, similar to ‘Campbell Early’ at Suwon. The berry weight was 7.5 g, 2 g bigger than that of ‘Campbell Early’. It had a total soluble solids (TSS) of 17.2%, about 3% TSS higher than ‘Campbell Early’, and low acidity (0.39%). The clusters were cone-shaped (conical) and had circular, juicy, and black-skin colored berries with abundant blooms. Clusters with moderately dense berry setting required no cluster thinning and resulted in low incidence of fruit cracking. ‘Tamnara’ vines had good cold hardness, resistance to downy mildew and anthracnose. It is recommended that ‘Tamnara’ be planted as replacement for ‘Campbell Early’, the leading table grape in Korea.
고 Cr-Mo강의 수정멱수법칙을 이용한 W.M. 크리프 수명예측
안종교(Jong Kyo An),유효선(Hyo Sun Yu),양성모(Sung Mo Yang),강희용(Hee Yong Kang) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.11
The high temperature creep properties of the generating plant's high temperature tube, pipe and header and such are very significant in accordance with long-time exposure to the high temperature and pressure environment. Not only this, but as the welding procedure is compulsory for the cohesion of components, the creep properties regarding the local microstructures of steel weldment are very important. In order to understand the creep properties regarding the local microstructures of steel weldment, the SP-Creep test which is easy to get sample from the field component was conducted. The local microstructure of steel weldment, that is, W.M. and B.M.'s microstructures were observed using the SEM. The rupture time of W.M. was longer as 110 % averagely in a same condition, which is the consequence of the difference of the microstructure. Each lethargy coefficient of B.M. and W.M. is evaluated by the relation among the temperature, load and the rupture time from SP-Creep Test. The life estimation equation can be induced by the transformation of Power-law. B.M. and W.M. for each 550 ℃ and 575 ℃, the very similar to normal temperature of the domestic thermal power generation in working, are estimated.