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Cha, Min Suc,Jo, Sang Woo,Han, Seung Hui,Hong, Soo Hyun,So, Soonyong,Kim, Tae-Ho,Oh, Seong-Geun,Hong, Young Taik,Lee, Jang Yong Elsevier 2019 Journal of Power Sources Vol.413 No.-
<P><B>Abstract</B></P> <P>Ether-free poly(<I>p</I>-phenylene)-based anion exchange membrane materials with outstanding vanadium ion blocking properties are reported. The synthesized ionomers with a rigid backbone structure show small dimensional variations despite the high ion exchange capacities. Among the synthesized membranes, the QPPP-2 membrane with ion exchange capacity of 2.1 meq·g<SUP>−1</SUP> exhibits high anion (OH<SUP>−</SUP>, SO<SUB>4</SUB> <SUP>2−</SUP>, and Cl<SUP>−</SUP>) conductivity. The QPPP-2 membrane shows an extremely low diffusion coefficient (2.12 × 10<SUP>−9</SUP> cm<SUP>2</SUP> min<SUP>−1</SUP>) for VO<SUP>2+</SUP>, which is much lower than that of Nafion 115 (2.88 × 10<SUP>−6</SUP> cm<SUP>2</SUP> min<SUP>−1</SUP>), indicating the vanadium ion blocking property of QPPP-2. Moreover, the chemical and operational stabilities of the membranes are investigated <I>via</I> ex situ soaking tests in 0.1 M VO<SUB>2</SUB> <SUP>+</SUP> solution and in situ operation tests for 100 cycles, respectively. The vanadium redox flow battery single cell assembled with the QPPP-2 membrane exhibits a coulombic efficiency of 99%, voltage efficiency of 87%, and energy efficiency of 86% during 100 cycles at 80 mA cm<SUP>−2</SUP>. The excellent chemical, morphological, and electrochemical properties of the QPPP-2 membrane make it suitable for use in vanadium redox flow battery.</P> <P><B>Highlights</B></P> <P> <UL> <LI> AEMs are fabricated by a Ni(0)-catalyzed cross-coupling reaction. </LI> <LI> The synthesized ionomers indicated excellent dimensional and chemical stability. </LI> <LI> Ether-free polymeric AEMs showed extremely low vanadium ion cross over. </LI> <LI> The performance of developed AEM showed high EE (87%) with high capacity retention. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
한국 정상 성인 남자에서의 혈청 총 콜레스테롤치 변화에 관한 최근 10년간 추적조사 -포항 지역 거주 직장인을 대상으로-
김영호 ( Kim Yeong Ho ),김종근 ( Kim Jong Geun ),이상우 ( Lee Sang U ),임성택 ( Im Seong Taeg ),차경우 ( Cha Gyeong U ),조영재 ( Jo Yeong Jae ),유선희 ( Yu Seon Hui ),이찬우 ( Lee Chan U ),김중구 ( Kim Jung Gu ) 대한내과학회 2003 대한내과학회지 Vol.65 No.6
목적: 혈청 콜레스테롤치는 우리나라에서도 식생활의 서구화로 변화가 있을 것으로 생각되며 청장년에서 연령이 증가할수록 증가한다고 알려져 있다. 우리나라 성인 남자에 있어서 동일인에 대한 연령 증가에 따른 콜레스테롤치의 변화를 알아보고 아울러 체중, 혈압, 공복 혈당 및 생활습관 (흡연, 음주, 운동)과의 연관성도 알아보기 위해 건강한 남자 직장인을 대상으로 최근 10년간의 정기 신체검사 자료를 분석해 보고자 하였다. 방법: 경북 포항 지역에서 근무하면서 Background: The serum total cholesterol is supposed to be increased as dietary pattern is Westernized recently in our country. We studied the longitudinal change of serum total cholesterol levels in normal Korean adult male workers and analyzed the influe