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Chen, Long,Li, Yanhui,Chen, Lina,Li, Na,Dong, Chenglong,Chen, Qiong,Liu, Beibei,Ai, Qing,Si, Pengchao,Feng, Jinkui,Zhang, Lin,Suhr, Jonghwan,Lou, Jun,Ci, Lijie Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.345 No.-
<P><B>Abstract</B></P> <P>A flexible and free-standing graphene oxide and nylon 6 (GO@nylon 6) multilayer nanofiltration membrane was prepared by a layer-by-layer assembly process. The combination of electrospinning and electrospraying technique was employed, which can facilely prepare large-area membrane with size of 20 × 30 cm. The mechanical stability of multilayer membrane has enhanced significantly due to the tightly locked structure achieved by nylon 6 nanofibers network. The novel GO@nylon 6–13 multilayer nanofiltration membrane demonstrated a pure water flux up to 11.15 L m<SUP>−2</SUP> h<SUP>−1</SUP> bar<SUP>−1</SUP>, while keeping high organic dye rejection rate (>95% for methylene blue, and >99% for methyl orange). The rejections rate of the Na<SUB>2</SUB>SO<SUB>4</SUB>, NaCl, CuSO<SUB>4</SUB>, and Pb(NO<SUB>3</SUB>)<SUB>2</SUB> were 56.5%, 27.6%, 36.7%, and 18.9%, respectively. Furthermore, GO@nylon 6–13 multilayer nanofiltration membrane also demonstrated a high flux of some common organic solvents (8.4, 5.3, and 0.8 L m<SUP>−2</SUP> h<SUP>−1</SUP> bar<SUP>−1</SUP> for methanol, ethanol, and NMP, respectively), showing excellent chemical stability for separation process in those solvents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Large-area GO@nylon 6 multilayer nanofiltration membrane was prepared. </LI> <LI> The multilayer structure enhances the mechanical stability. </LI> <LI> The multilayer membrane demonstrates a high water flux. </LI> <LI> The multilayer membrane shows high rejection rate for organic dyes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Photograph and cross-section SEM image of GO@nylon 6 multilayer nanofiltration membrane, the inset shows the water contact angle.</P> <P>[DISPLAY OMISSION]</P>
Lin, Jia,Chen, Hong,Gao, Yang,Cai, Yao,Jin, Jianbo,Etman, Ahmed S.,Kang, Joohoon,Lei, Teng,Lin, Zhenni,Folgueras, Maria C.,Quan, Li Na,Kong, Qiao,Sherburne, Matthew,Asta, Mark,Sun, Junliang,Toney, Mic National Academy of Sciences 2019 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.116 No.47
<P><B>Significance</B></P><P>Metal halide perovskites attract great interest for a wide range of applications due to their remarkable optoelectronic properties. The development of environmentally friendly halide perovskite materials with various crystal structures and compositions offers unprecedented opportunities to achieve desired properties and applications. In this work, we demonstrated an In-based, charge-ordered all-inorganic halide double perovskite with the composition of Cs<SUB>2</SUB>In(I)In(III)Cl<SUB>6</SUB> synthesized by solid-state reaction. High-pressure optical properties were studied, and a pressure-driven, fully reversible semiconductor–metal phase transition was discovered. This In-based charge-ordered structure may inspire new understanding of halide perovskite as well as provide a platform for future discovery of exotic electronic phenomena such as high-<I>T</I><SUB>C</SUB> superconductivity in halide perovskite compounds.</P><P>Phase transitions in halide perovskites triggered by external stimuli generate significantly different material properties, providing a great opportunity for broad applications. Here, we demonstrate an In-based, charge-ordered (In<SUP>+</SUP>/In<SUP>3+</SUP>) inorganic halide perovskite with the composition of Cs<SUB>2</SUB>In(I)In(III)Cl<SUB>6</SUB> in which a pressure-driven semiconductor-to-metal phase transition exists. The single crystals, synthesized via a solid-state reaction method, crystallize in a distorted perovskite structure with space group <I>I</I>4/<I>m</I> with <I>a</I> = 17.2604(12) Å, <I>c</I> = 11.0113(16) Å if both the strong reflections and superstructures are considered. The supercell was further confirmed by rotation electron diffraction measurement. The pressure-induced semiconductor-to-metal phase transition was demonstrated by high-pressure Raman and absorbance spectroscopies and was consistent with theoretical modeling. This type of charge-ordered inorganic halide perovskite with a pressure-induced semiconductor-to-metal phase transition may inspire a range of potential applications.</P>
The Sustainability of Government Debt in Korea
Na Seong-Lin(나성린),Park Ki-Baeg(박기백),Park Hyung-Soo(박형수) 한국재정학회(구 한국재정·공공경제학회) 2007 공공경제 Vol.12 No.2
본 연구는 논란이 되고 있는 정부부채의 안정성을 검증하기 위하여 3가지 분석을 실시하였다. Bohn"s test에 따르면 우리나라는 정부부채에 적절히 반응하므로 재정안정성이 있는 것으로 나타났다. 지출 전망을 이용하여 재정안정에 필요한 세입 증대 수준(Tax gap)을 계산한 결과를 보면 단기나 중기는 문제가 없다. 그러나 장기적으로는 연금재정 악화, 복지지출 증대로 세입 증대가 불가피한 것으로 나타나고 있다. 경제수준이나 정치적 요인 등을 감안하여 부채수준을 국제비교한 지수(IGDC index)를 보면 우리나라는 외국보다 부채 수준이 낮지만 최근 증가하는 추세를 보이고 있다.<BR> 따라서 공적연금의 잠재적인 부채, 경제성장의 정체, 고령화 및 저출산 등의 재정 여건을 감안하면, 장기적인 재정안정성을 확보하기 위하여 공적연금의 개혁이 필수적이고, 정부는 우리나라의 부채수준 증가에 더욱 더 조심하여야 한다. We carried out three different tests to check the sustainability of government debt in Korea: Bohn"s test, tax gap test and IGDC index. We find some consistency in the result for all three tests. Namely, the government debt in Korea seems to be sustainable in the short or medium term, but may not be sustainable in the long term.<BR> In particular, considering huge potential deficit in public pension system and rapid slowdown in future growth rate together with rapid aging and low birth rate, Korean government needs to pay special attention to the pace of government debt level in Korea.
娜琳(Na Lin) 단국대학교 몽골연구소 2019 몽골지역연구 Vol.4 No.2
蒙古国是中国的近邻, 是“一带一路”重要沿线国家, 也是最早支持和积极参与中国“一带一路”倡议的国家之一。而内蒙古自治区是实施 “一带一路”倡议和中蒙俄经济走廊的核心枢纽地区, 特别是在实现中国“一带一路”倡议和蒙古国“发展之路”战略对接合作当中, 内蒙古自治区和蒙古国的经贸合作将占有举足轻重的重要地位。 Inner Mongolia Autonomous Region and Mongolia are connected by mountains and rivers and live close to each other. It plays a bridge and link role in the development of bilateral relations between China and Mongolia. Bilateral economic and trade cooperation between the Inner Mongolia Autonomous Region and Mongolia plays an important role in China’s “the Belt and Road initiative and Mongolia’s “development road strategy”. This article briefly introduces the pragmatic cooperation process in the framework of the Belt and Road and “development road” in China and Mongolia, the basic situation of the Inner Mongolia Autonomous Region and Mongolia, and the current situation of investment and trade between the two countries. On this basis, it makes a risk assessment on the cooperation between the two sides, and puts forward some countermeasures and suggestions for future reform.
娜琳(Na Lin) 단국대학교 몽골연구소 2017 몽골지역연구 Vol.2 No.2
This paper expounds the particularity and importance of the strategic position of Mongolia, North Korea and South Korea. From the political, economic and cultural perspective discusses the close relationship of Mongolia and South Korea, North Korea’s. Looking forward to Mongolia’s mediation of the Korean Peninsula issue base on the good relations of Mongolia and South & North koreas. It will relaxation of the situation on the korea peninsula will have a positive impact. At the same time, for China’s adherence to the policy of peace and stability, denuclearization and the Korean Peninsula through dialogue and consultation is undoubtedly positive support.