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Choe, Seunghoe,Lee, Byung-Seok,Cho, Min Kyung,Kim, Hyoung-Juhn,Henkensmeier, Dirk,Yoo, Sung Jong,Kim, Jin Young,Lee, So Young,Park, Hyun S.,Jang, Jong Hyun Elsevier 2018 Applied Catalysis B Vol.226 No.-
<P><B>Abstract</B></P> <P>In this study, IrO<SUB>2</SUB>-coated Ti mesh (e-IrO<SUB>2</SUB>/Ti) is proposed to be an efficient and durable oxygen electrode for high-temperature polymer-membrane-electrolyte water electrolyzers (HT-PEMWEs). A thin IrO<SUB>2</SUB> film of submicron thickness was uniformly coated onto a porous Ti mesh substrate by anodic electrodeposition. The electrodeposited IrO<SUB>2</SUB> film plays the dual role of a catalyst layer for the oxygen evolution reaction (OER), and a corrosion-protection layer that prevents oxidation of the inner Ti. The e-IrO<SUB>2</SUB>/Ti exhibited high performance (0.97 A cm<SUP>−2</SUP> at 1.6 V) despite a low IrO<SUB>2</SUB> loading (0.4 mg cm<SUP>−2</SUP>) in single-cell tests conducted at 120 °C, which is comparable to that of conventional electrodes with greater catalyst loadings (0.8–5 mg cm<SUP>−2</SUP>). Furthermore, corrosion polarization tests reveal that the IrO<SUB>2</SUB> coating physically blocks exposure of the Ti diffusion layer, thereby reducing Ti corrosion by 82% in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> at 25 °C. The low degradation rate (1.5 mA cm<SUP>‐2</SUP> h<SUP>−1</SUP> (0.11% h<SUP>−1</SUP>)) obtained in aging experiments at 120 °C and 1.72 V (voltage efficiency of 85%) confirms the excellent stability of this electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A thin IrO<SUB>2</SUB> film is uniformly coated on porous Ti mesh via anodic electrodeposition. </LI> <LI> The IrO<SUB>2</SUB> film is an efficient catalyst layer for the oxygen evolution reaction. </LI> <LI> A high current density (0.97 A cm<SUP>−2</SUP> at 1.6 V) at 0.4 mg cm<SUP>−2</SUP> is produced at 120 °C. </LI> <LI> The electrodeposited film physically blocks exposure of the Ti diffusion layer. </LI> <LI> The IrO<SUB>2</SUB> film protects against Ti corrosion and improves cell durability at 120 °C. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
홍삼 및 천연물 혼합소재의 비만 유도 흰쥐에 대한 항비만 효과에 관한 연구
이성계(Seongkye Lee),소승호(Seungho So),황의일(Euiil Hwang),구본석(Bonsuk Koo),한경호(Gyeongho Han),고상범(Sangbeom Ko),김나미(Nami Kim) 한국식품영양과학회 2008 한국식품영양과학회지 Vol.37 No.4
홍삼과 보이차, 노팔선인장을 소재로 하여 체중조절효과가 우수하고 부작용이 없는 최적의 원료와 적정 섭취 농도를 설정하고자 홍삼, 보이차, 노팔선인장 혼합소재(DM1) 및 홍삼, 보이차 혼합소재(DM2)를 고지방식이로 8주간 비만을 유도한 수컷 흰쥐에게 100, 300, 500 ㎎/㎏의 농도로 8주간 투여하면서 체중, 혈중 지질 분석, 복부 및 기타지방 조직, 비만에 관련된 몇 가지 생화학적 지표를 조사하였고, 간 기능과 신장 기능, 조혈 기능을 나타내는 생화학적 지표를 조사하였다. 체중은 고지방식이군에 비하여 DM1 투여군에서 77.1~51.8%, DM2 투여군에서 64.7~16.1% 수준으로 증가하였다. 중성 지질의 농도는 DM1 투여군에서 고지방 식이군의 84~54%, DM2 투여군에서 62~58%의 수준을 나타내었다. 혈청 렙틴의 농도는 DM2 투여군에서 농도 의존적으로 감소하여 고지방식이군의 82.8~66.9%로 감소되었다. 혈중 인슐린의 농도는 DM1 투여군에서 고지방식이군의 66.8~65.1%, DM2 투여군에서 66.7~62.5%의 수준이었으며 1% 수준에서 통계적인 유의성을 나타내었다. 부고환 주위지방(좌/우), 내장지방, 신장주위 지방의 무게는 DM1 500 ㎎/㎏과 DM2 300, 500 ㎎/㎏ 투여에서 1% 수준에서 통계적으로 유의적인 감소를 나타내었고 DM2는 정상식이군의 수준으로까지 감소되는 우수한 효과를 나타내었다. 간 조직내 지질침착도는 DM2 500 ㎎/㎏ 투여군에서는 감소하였다(p<0.05). 간과 신장의 이상 유무를 판단할 수 있는 AST, ALT 및 ALP, T-BIL, BUN 및 WBC 수치는 시험물질 섭취군에서 고지방식이군에 비하여 큰 변화를 나타내지 않았고 RBC는 DM2 500 ㎎/㎏ 투여군에서 다소 증가하였고 다른 시험군에서는 큰 변화가 없어서 부작용이 없음을 확인하였다. 이상의 실험결과를 종합해 보면 홍삼과 보이차, 노팔선인장을 소재로 한 DM1과 DM2 복합 소재는 항비만 효과가 우수하고 부작용이 없었으며, 홍삼과 보이차를 혼합한 DM2의 효과가 더 우수하였으며, 적정 섭취 농도는 DM1은 500 ㎎/㎏, DM2는 300~500 ㎎/㎏인 것으로 판단된다. Anti-obesity effects of ginseng and herbal plant mixtures were investigated to develop natural materials for anti-obesity. After inducing obesity with high fat diet for 8 weeks in male SD rats, ginseng and herbal plant mixtures DM1 (ginseng, puer tea, opuntia) and DM2 (ginseng, puer tea) were administrated orally to rats for another 8 weeks. During administration, food efficacy ratio and body weight of rat were measured twice weekly. After administration, body weight, body fat contents, and serum lipid level were estimated for anti-obesity effect and hematological analysis blood level of ALP and ASP was checked for safety. Body weight in rats fed high fat diet was significantly increased. Body weight in obese rats induced by high fat diet was significantly decreased by DM1 and DM2 feedings. The amount of body fat (epididymal, perirenal and visceral fat, brown adipose tissue) was significantly reduced by DM1 and DM2 treatments. The amount of TG, the concentration of leptin in blood plasma, and the concentration of insulin in blood plasma were significantly diminished by DM1 and DM2. Lipid accumulation on liver was reduced in DM2. There were no side effects among all groups according to blood analysis, hematological findings, and body weight. The findings of this study suggest that DM1 and DM2 may be effective materials for anti-obesity through reducing plasma triglyceride and body fats, and also decreasing body weight without side effects.
소정수,도규성,장윤제,송승호,한정수,문희장,So, Jungsoo,Do, Gyusung,Jang, Yunje,Song, Seungho,Han, Jungsoo,Moon, Heejang 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.2
This paper describes the performance characteristics of flow and structure in the post-chamber and nozzle. Using the computational fluid dynamics (CFD) technique, the stress and compressible flow fields in the downstream of the post chamber and nozzle were numerically calculated. Besides, the stress characteristics at the wall of post-chamber and nozzle were investigated under different thickness (2mm, 5mm and 10mm) of the nozzle wall. The stress pattern demonstrates that the strength of nozzle wall having 10mm is safer than that of 5mm or 2mm according to von Mises stress irrespective to the pressure field
Cho, Min Kyung,Park, Hee-Young,Choe, Seunghoe,Yoo, Sung Jong,Kim, Jin Young,Kim, Hyoung-Juhn,Henkensmeier, Dirk,Lee, So Young,Sung, Yung-Eun,Park, Hyun S.,Jang, Jong Hyun Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>To improve the cell performance for alkaline anion exchange membrane water electrolysis (AEMWE), the effects of the amount of polytetrafluoroethylene (PTFE) non-ionomeric binder in the anode and the hot-pressing conditions during the fabrication of the membrane electrode assemblies (MEAs) on cell performances are studied. The electrochemical impedance data indicates that hot-pressing at 50 °C for 1 min during MEA construction can reduce the polarization resistance of AEMWE by ∼12%, and increase the initial water electrolysis current density at 1.8 V (from 195 to 243 mA cm<SUP>−2</SUP>). The electrochemical polarization and impedance results also suggest that the AEMWE performance is significantly affected by the content of PTFE binder in the anode electrode, and the optimal content is found to be 9 wt% between 5 and 20 wt%. The AEMWE device fabricated with the optimized parameters exhibits good water splitting performance (299 mA cm<SUP>−2</SUP> at 1.8 V) without noticeable degradation in voltage cycling operations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects of MEA fabrication parameters on alkaline AEMWE performance were examined. </LI> <LI> Optimal PTFE binder content in the anode is 9 wt% within the range of 5–20 wt%. </LI> <LI> Hot-pressing the MEA at 50 °C, 669 psi improved the performance by 12%. </LI> </UL> </P>